chore(deps): update sigstore/gh-action-sigstore-python action to v3.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
sigstore/gh-action-sigstore-python	action	minor	v3.0.1 -> v3.1.0

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Release Notes

sigstore/gh-action-sigstore-python (sigstore/gh-action-sigstore-python)

v3.1.0

Compare Source

gh-action-sigstore-python is now compatible with Rekor v2
transparency log (but produced signature bundles still contain Rekor v1 entries by default).

Changed

• The action now uses sigstore-python 4.1. All other dependencies are also updated
  (#​220)

Fixed

• Fixed incompatibility with Python 3.14 by upgrading dependencies
  (#​225)

Added

• rekor-version argument was added to control the Rekor transparency log
  version when signing. The default version in the gh-action-sigstore-python
  3.x series will remain 1 (except when using staging: true).
  (#​228)

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