ci: bump actions/checkout to v5

[rejected-l]

Maintenance update to actions/checkout@v5 to align with the current runner stack (Node 24); nothing else modified.

Release notes: https://github.com/actions/checkout/releases/tag/v5.0.0

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PR-Codex overview

This PR updates the version of the actions/checkout from v4 to v5 across multiple workflow files, ensuring the latest features and improvements are utilized.

Detailed summary

• Updated actions/checkout from v4 to v5 in:
  • .github/workflows/ci.yml
  • .github/workflows/release.yml
  • .github/workflows/release-packages.yml
  • .github/workflows/publish.yml

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Latest commit: d1c51c3

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