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] <support@github.com>

.github/workflows/ci.yml

@@ -91,7 +91,7 @@ jobs:
           path: ./dist
 
       - 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/release.yml

@@ -69,7 +69,7 @@ jobs:
           path: ./dist
 
       - 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