chore(deps-dev): bump pyinstaller from 6.20.0 to 6.21.0

[dependabot]

Bumps pyinstaller from 6.20.0 to 6.21.0.

Release notes

Sourced from pyinstaller's releases.

v6.21.0

Please see the v6.21.0 section of the changelog for a list of the changes since v6.20.0.

Changelog

Sourced from pyinstaller's changelog.

6.21.0 (2026-06-13)

Features

* Add support for Python 3.15. (:issue:`9456`)
* Initial support for setting :ref:`alternative splash screen centering modes
  <splash screen centering>` for multi-monitor setups. (:issue:`6271`)
Hooks

* Prevent ``_ios_support`` and ``libobjc.so`` from being collected on non-IOS
  platforms if :mod:`webbrowser` is imported. (:issue:`9436`)
* Update ``scipy`` hook for compatibility with upcoming ``scipy`` v1.18.0.
  (:issue:`9450`)
* Update the ``gi.repository.Adw`` hook to collect translation files
  for ``libadwaita``. (:issue:`9444`)
Documentation

</code></pre>

<ul>

<li>Document known issues with using splash screen in <code>onedir</code> GUI-based

applications. (:issue:<code>9425</code>)</li>

<li>Document the &quot;glowing magenta border&quot; problem in splash screen when

splash screen image contains semi-transparent pixels (for example,

due to feathered edges). (:issue:<code>9425</code>)</li>

</ul>

</blockquote>

</details>

<details>

<summary>Commits</summary>
<ul>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/1cda34561015a90b6e1ae31dc89703799adaf13e&quot;&gt;&lt;code&gt;1cda345&lt;/code&gt;&lt;/a> Release v6.21.0. [skip ci]</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/14b6af36cd7284360e7094e66e97ddef76412876&quot;&gt;&lt;code&gt;14b6af3&lt;/code&gt;&lt;/a> tests: use different module in TestModuleGraph::test_find_module</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/6041ae39584fbb0606c1f936e33e656c075859a8&quot;&gt;&lt;code&gt;6041ae3&lt;/code&gt;&lt;/a> tests: modulegraph: skip tests that are incompatible with python 3.15</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/dd3c5601e58fa3b7993486d5bd9f769653f6ee24&quot;&gt;&lt;code&gt;dd3c560&lt;/code&gt;&lt;/a> tests: adjust bytecode sanity-check tests for python 3.15</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/08f4d82600302727dfc210ec38aa9eeebaf7a671&quot;&gt;&lt;code&gt;08f4d82&lt;/code&gt;&lt;/a> modulegraph: adapt _scan_bytecode() for changes in python 3.15</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/13c2e638918528e7b15b7f048aa01d6de9fe9b50&quot;&gt;&lt;code&gt;13c2e63&lt;/code&gt;&lt;/a> modulegraph: improve assert messages in _scan_bytecode()</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/d4fd4f442a214a656e4fc690f86e998d08d46bcb&quot;&gt;&lt;code&gt;d4fd4f4&lt;/code&gt;&lt;/a> depend: bytecode: add support for LOAD_COMMON_CONSTANT</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/5a9f21030ed91f7dc394a24c4e660c742ad6bf07&quot;&gt;&lt;code&gt;5a9f210&lt;/code&gt;&lt;/a> bootstrap: fix issues caused by encodings being frozen in python 3.15</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/8d97d35a2c04162be04a33748318308e09d398a4&quot;&gt;&lt;code&gt;8d97d35&lt;/code&gt;&lt;/a> tests: test_spec_options: explicitly disable argparse colored output</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/10d0772984f885246d002a7963c728c118639225&quot;&gt;&lt;code&gt;10d0772&lt;/code&gt;&lt;/a> tests: use can_import_module('tkinter') with all tkinter/splash tests</li>

<li>Additional commits viewable in <a href="https://github.com/pyinstaller/pyinstaller/compare/v6.20.0...v6.21.0&quot;&gt;compare view</a></li>

</ul>

</details>
<br />

[rtibblesbot]

Dependabot patch bump: pyinstaller 6.20.0 → 6.21.0 in the build dev-extras group (pyproject.toml).

• Semver risk: patch. Dependency type: development (packaging/build tool only, not shipped in the app runtime).
• Changelog: no breaking changes or security fixes — additive only (Python 3.15 support, splash-screen multi-monitor centering, scipy/gi.repository.Adw/webbrowser hook updates).
• CI: failing on all three jobs (lint/uv-lock, Build Unsigned EXE, Build Unsigned DMG), all with the identical root cause — not a compatibility issue with the new pyinstaller release.

Blocking:

• pyproject.toml:46 pins exclude-newer = "2026-06-03T00:00:00Z", which predates pyinstaller 6.21.0's publish date (2026-06-13). uv therefore refuses to resolve the bump ("No solution found... pyinstaller was filtered by exclude-newer"). This is maintainer-controlled housekeeping outside this PR's diff — Dependabot can't fix it. Someone needs to bump exclude-newer past 2026-06-13 in a separate change before this PR can pass CI, or this PR should stay closed until that happens.

---

@rtibblesbot's comments are generated by an LLM, and should be evaluated accordingly

How was this generated?

Ran a dependency-update review pipeline over the version bump:

• Classified the bump by semver (patch / minor / major) and dependency type (production vs. development)
• Extracted the changelog and release notes across the version range
• Assessed compatibility with this project's usage and whether any code changes are required
• Treated CI as the primary safety net
• Scaled the review depth to the update's risk
• Chose the verdict from semver risk, changelog findings, and CI status

[rtibbles]

@dependabot rebase

[rtibblesbot]

1 of 1 prior findings resolved; 1 new blocking finding (see below).

Dependency update: pyinstaller 6.20.0 → 6.21.0 (dev dependency, build group) — semver minor. Changelog: no breaking changes, deprecations, or security fixes; additive only (Python 3.15 support, splash-screen options, unused hook updates). CI failing.

blocking

pyproject.toml:23 — uv.lock was not regenerated for this bump. The uv-lock prek hook fails in CI because the lockfile still pins pyinstaller==6.20.0 (and the transitive pyinstaller-hooks-contrib at 2026.5) while pyproject.toml now requires 6.21.0. Run uv lock and commit the resulting uv.lock diff (includes the pyinstaller-hooks-contrib 2026.5 → 2026.6 bump) before this can pass CI.

Prior-finding status

RESOLVED — pyproject.toml:44 — stale exclude-newer date blocked uv resolution of pyinstaller 6.21.0

---

@rtibblesbot's comments are generated by an LLM, and should be evaluated accordingly

How was this generated?

Ran a dependency-update review pipeline over the version bump:

• Classified the bump by semver (patch / minor / major) and dependency type (production vs. development)
• Extracted the changelog and release notes across the version range
• Assessed compatibility with this project's usage and whether any code changes are required
• Treated CI as the primary safety net
• Scaled the review depth to the update's risk
• Chose the verdict from semver risk, changelog findings, and CI status