Bump sigstore/gh-action-sigstore-python from 1.2.3 to 2.0.1 (#195)

Bumps [sigstore/gh-action-sigstore-python](https://github.com/sigstore/gh-action-sigstore-python) from 1.2.3 to 2.0.1.
- [Release notes](https://github.com/sigstore/gh-action-sigstore-python/releases)
- [Commits](https://github.com/sigstore/gh-action-sigstore-python/compare/v1.2.3...v2.0.1)

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

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