chore: upgrade tar to ^7.5.20 to address CVE-2026-59873

Refreshed the yarn.lock entry for the transitive `tar` dependency
(pulled in via node-gyp and cacache) from 7.5.16 to 7.5.20. The existing
^7.4.3 range already admitted the patched release, so no package.json
change was needed.

Generated with [Linear](https://linear.app/sourcebot/issue/SOU-1553/sourcebot-devsourcebot-cve-2026-59873-tar-node-tar-denial-of-service#agent-session-e185a0a5)

Co-authored-by: linear-code[bot] <222613912+linear-code[bot]@users.noreply.github.com>

Author: linear-code[bot]

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- Upgraded `tar` to `^7.5.20` to address CVE-2026-59873. [#1473](https://github.com/sourcebot-dev/sourcebot/pull/1473)
+
 ## [5.1.3] - 2026-07-20
 
 ### Added

yarn.lock

@@ -22857,15 +22857,15 @@ __metadata:
   linkType: hard
 
 "tar@npm:^7.4.3":
-  version: 7.5.16
-  resolution: "tar@npm:7.5.16"
+  version: 7.5.20
+  resolution: "tar@npm:7.5.20"
   dependencies:
     "@isaacs/fs-minipass": "npm:^4.0.0"
     chownr: "npm:^3.0.0"
     minipass: "npm:^7.1.2"
     minizlib: "npm:^3.1.0"
     yallist: "npm:^5.0.0"
-  checksum: 10c0/4f37f3c4bd2ca2755fd736a5df1d573c1a868ec1b1e893346aeafa95ac510f9e2fd1469420bd866cc7904799e5bd4ac62b5d4f03fe27747d6e1e373b44505c5c
+  checksum: 10c0/4df4335c6d958b76adf1eaced55889dec3ca1c51f450658a074af80694bb0d9c154a8e93fdf4da617372d1575b121295379993961bbe4cd4b0867c0e5689846a
   languageName: node
   linkType: hard