Bump the actions group with 2 updates (#638)

Bumps the actions group with 2 updates: [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) and [actions/cache](https://github.com/actions/cache).


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)

Updates `actions/cache` from 4.2.0 to 4.2.1
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@1bd1e32...0c907a7)

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

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

.github/workflows/release.yml

@@ -27,7 +27,7 @@ jobs:
 
       - uses: imjasonh/setup-crane@31b88efe9de28ae0ffa220711af4b60be9435f6e # v0.4
 
-      - uses: sigstore/cosign-installer@c56c2d3e59e4281cc41dea2217323ba5694b171e # v3.8.0
+      - uses: sigstore/cosign-installer@d7d6bc7722e3daa8354c50bcb52f4837da5e9b6a # v3.8.1
 
       - uses: anchore/sbom-action/download-syft@f325610c9f50a54015d37c8d16cb3b0e2c8f4de0 # v0.18.0
 

.github/workflows/validate-release.yml

@@ -20,14 +20,14 @@ jobs:
           go-version-file: 'go.mod'
           check-latest: true
 
-      - uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
+      - uses: actions/cache@0c907a75c2c80ebcb7f088228285e798b750cf8f # v4.2.1
         with:
           path: ~/go/pkg/mod
           key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
           restore-keys: |
             ${{ runner.os }}-go-
 
-      - uses: sigstore/cosign-installer@c56c2d3e59e4281cc41dea2217323ba5694b171e # v3.8.0
+      - uses: sigstore/cosign-installer@d7d6bc7722e3daa8354c50bcb52f4837da5e9b6a # v3.8.1
       - uses: anchore/sbom-action/download-syft@f325610c9f50a54015d37c8d16cb3b0e2c8f4de0 # v0.18.0
       - uses: goreleaser/goreleaser-action@90a3faa9d0182683851fbfa97ca1a2cb983bfca3 # v6.2.1
         with: