chore: bump sigstore/gh-action-sigstore-python from 2.1.1 to 3.0.0 (#1818)

Bumps [sigstore/gh-action-sigstore-python](https://github.com/sigstore/gh-action-sigstore-python) from 2.1.1 to 3.0.0.
- [Release notes](https://github.com/sigstore/gh-action-sigstore-python/releases)
- [Changelog](https://github.com/sigstore/gh-action-sigstore-python/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sigstore/gh-action-sigstore-python/compare/61f6a500bbfdd9a2a339cf033e5421951fbc1cd2...f514d46b907ebcd5bedc05145c03b69c1edd8b46)

---
updated-dependencies:
- dependency-name: sigstore/gh-action-sigstore-python
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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GitOrigin-RevId: 8381e42c3f57ac5f4fd60b53242cc93c4f4e0675
Change-Id: I3669e74b32f29800454520b05f3843db71c25af7