Bump sigstore/gh-action-sigstore-python

Bumps the actions-dependencies group with 1 update: [sigstore/gh-action-sigstore-python](https://github.com/sigstore/gh-action-sigstore-python).


Updates `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](sigstore/gh-action-sigstore-python@v2.1.1...v3.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci.yml

@@ -59,7 +59,7 @@ jobs:
       #    The name 'cleanpy' is too similar to an existing project. See https://test.pypi.org/help/#project-name for more information.
 
       - name: Sign the dists with Sigstore
-        uses: sigstore/gh-action-sigstore-python@v2.1.1
+        uses: sigstore/gh-action-sigstore-python@v3.0.0
         with:
           inputs: >-
             ./dist/*.tar.gz

.github/workflows/publish.yml

@@ -41,7 +41,7 @@ jobs:
       uses: pypa/gh-action-pypi-publish@release/v1
 
     - name: Sign the dists with Sigstore
-      uses: sigstore/gh-action-sigstore-python@v2.1.1
+      uses: sigstore/gh-action-sigstore-python@v3.0.0
       with:
         inputs: >-
           ./dist/*.tar.gz