Bump sigstore/gh-action-sigstore-python from 3.0.1 to 3.1.0 (AcademySoftwareFoundation#521)

Bumps [sigstore/gh-action-sigstore-python](https://github.com/sigstore/gh-action-sigstore-python) from 3.0.1 to 3.1.0.
- [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@f7ad0af...f832326)

---
updated-dependencies:
- dependency-name: sigstore/gh-action-sigstore-python
  dependency-version: 3.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/release-sign.yml

@@ -54,7 +54,7 @@ jobs:
         run: git archive --format=tar.gz -o ${IMATH_TARBALL} --prefix ${IMATH_PREFIX} ${TAG}
 
       - name: Sign archive with Sigstore
-        uses: sigstore/gh-action-sigstore-python@f7ad0af51a5648d09a20d00370f0a91c3bdf8f84 # v3.0.1
+        uses: sigstore/gh-action-sigstore-python@f832326173235dcb00dd5d92cd3f353de3188e6c # v3.1.0
         with:
           inputs: ${{ env.IMATH_TARBALL }}
           upload-signing-artifacts: false