ci: update deprecated runners and actions

[TimeToBuildBob]

Summary

• ubuntu-20.04 → ubuntu-24.04 (deprecated, causing CI timeouts)
• macOS-11 → macos-latest (deprecated)
• actions/checkout@v2 → actions/checkout@v4
• Unpin poetry version (1.3.2 workaround no longer needed)

Context

All recent CI runs (last ~5) have been timing out or getting cancelled because the deprecated runners are no longer available from GitHub. This affects all PRs in the repo, including #77 and #78.

Test plan

• CI passes on all three platforms (ubuntu-24.04, windows-latest, macos-latest)

---

Important

Update CI configurations to use non-deprecated runners and actions, and unpin poetry version.

• CI Runners:
  • Update ubuntu-20.04 to ubuntu-24.04 in .github/workflows/build.yml.
  • Update macOS-11 to macos-latest in .github/workflows/build.yml.
• Actions:
  • Update actions/checkout@v2 to actions/checkout@v4 in .github/workflows/build.yml.
• Dependencies:
  • Unpin poetry version in .github/workflows/build.yml, removing 1.3.2 workaround.

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[greptile-apps]

Greptile Summary

Updated CI configuration to use non-deprecated GitHub Actions runners and actions, resolving CI timeout issues caused by unavailable deprecated runners.

• Updated ubuntu-20.04 to ubuntu-24.04 and macOS-11 to macos-latest
• Updated actions/checkout@v2 to actions/checkout@v4
• Removed poetry version pin (1.3.2 workaround no longer needed)
• Added quotes around Python version number for proper YAML formatting

Confidence Score: 5/5

• This PR is safe to merge with minimal risk - it updates deprecated CI infrastructure with no code changes
• All changes are CI configuration updates to address deprecated runners and actions. The updates are straightforward, well-documented, and will be validated by CI runs before merging. No application code is modified.
• No files require special attention

Important Files Changed

Filename	Overview
.github/workflows/build.yml	Updated deprecated runners (ubuntu-24.04, macos-latest) and actions/checkout to v4, unpinned poetry version

_{Last reviewed commit: fd61ef9}

[greptile-apps]

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