ci: bump checkout v4→v6, setup-python v5→v6 (Node 24)#2
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GitHub deprecated Node.js 20 actions starting June 2, 2026 (forced default flip to Node 24) and will remove Node 20 from runners on September 16, 2026. Both action majors have Node 24 builds: - actions/checkout v5+ (latest patch: 6.0.2, released 2026-01-09) - actions/setup-python v6+ (latest patch: 6.2.0, released 2026-01-22) We only use the default checkout and pass python-version to setup-python. No breaking API surface for our usage in either major bump.
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Summary
CI annotations on PR #1 warned that
actions/checkout@v4andactions/setup-python@v5run on Node.js 20, which GitHub deprecated. Forced flip to Node 24 default on June 2, 2026; Node 20 removed from runners on September 16, 2026.Bump both to v6 majors, which ship Node 24:
actions/checkout@v6(latest patch v6.0.2, released 2026-01-09)actions/setup-python@v6(latest patch v6.2.0, released 2026-01-22)Compatibility review
python-version: ${{ matrix.python-version }}. v6.0.0 release notes label "Upgrade to node 24" as the only breaking change. Our usage is stable. ✓Test plan
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