Bump sigstore/cosign-installer from 3.8.0 to 3.8.1 in the actions group

Bumps the actions group with 1 update: [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer).


Updates `sigstore/cosign-installer` from 3.8.0 to 3.8.1
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@c56c2d3...d7d6bc7)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

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

Author: dependabot[bot]

.github/workflows/release.yml

@@ -35,7 +35,7 @@ jobs:
           go-version: '1.23'
           check-latest: true
 
-      - uses: sigstore/cosign-installer@c56c2d3e59e4281cc41dea2217323ba5694b171e # v3.8.0
+      - uses: sigstore/cosign-installer@d7d6bc7722e3daa8354c50bcb52f4837da5e9b6a # v3.8.1
 
       - name: Install bom
         uses: kubernetes-sigs/release-actions/setup-bom@a69972745f85aab4ba5d6c681e2a0e7f73eaff2b # v0.3.0