ci: fix build workflow for modern GitHub Actions runners

[TimeToBuildBob]

Summary

• ubuntu-20.04 was removed from GitHub Actions, causing all CI jobs to be stuck in "queued" indefinitely
• Updated to ubuntu-22.04, macos-latest, Python 3.11, and latest action versions
• Replaced qt5-default (nonexistent on Ubuntu 22.04+) with Qt6 runtime dependencies

Fixes #118

Changes

Before	After
ubuntu-20.04	ubuntu-22.04
macOS-13	macos-latest
Python 3.9 (EOL)	Python 3.11
actions/checkout@v3	@v4
actions/setup-python@v4	@v5
qt5-default	libxcb-cursor0 libfontconfig1 libegl1

Test plan

• CI should now run instead of hanging in "queued"
• All three platforms (Linux, Windows, macOS) should build
• Integration tests on Linux should pass with xvfb

---

Important

Update CI workflow to use ubuntu-22.04, macos-latest, Python 3.11, and latest GitHub Actions versions, replacing deprecated dependencies.

• CI Environment:
  • Update ubuntu-20.04 to ubuntu-22.04 and macOS-13 to macos-latest in build.yml.
  • Update Python version from 3.9 to 3.11.
  • Update actions/checkout to v4 and actions/setup-python to v5.
• Dependencies:
  • Replace qt5-default with libxcb-cursor0, libfontconfig1, and libegl1 for Qt6 compatibility on Linux.
• Behavior:
  • Fixes CI jobs hanging in "queued" state by updating to supported environments.

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[greptile-apps]

Greptile Summary

Updates CI workflow to use modern GitHub Actions runners and dependencies. Changes address the removal of ubuntu-20.04 from GitHub Actions (which caused jobs to hang in "queued") by upgrading to ubuntu-22.04, macos-latest, Python 3.11, and latest action versions. Correctly replaces the nonexistent qt5-default package with Qt6 runtime dependencies (libxcb-cursor0, libfontconfig1, libegl1) that match the project's PyQt6 6.5.3 dependency. All changes align with the project's Python version requirements (^3.8,<3.14) and are necessary for CI to function again.

Confidence Score: 4/5

• Safe to merge after CI validates all platforms build successfully
• All changes are necessary and correct: ubuntu-20.04 was removed from GitHub Actions, qt5-default doesn't exist on Ubuntu 22.04+, and Python 3.9 is EOL. The Qt6 runtime dependencies match the project's PyQt6 6.5.3 requirement. macOS runner change from macOS-13 to macos-latest should work given ARM64 support in dependencies, but needs CI validation.
• No files require special attention - verify CI passes on all three platforms

Important Files Changed

Filename	Overview
.github/workflows/build.yml	Updated CI runners and dependencies from deprecated versions (ubuntu-20.04, Python 3.9) to modern ones (ubuntu-22.04, Python 3.11), replaced qt5-default with Qt6 runtime libraries, and updated action versions to v4/v5.

_{Last reviewed commit: ca368b7}

[greptile-apps]

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