Bump sigstore/cosign-installer from 2.8.0 to 2.8.1 (#49)

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 2.8.0 to 2.8.1.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@7cc35d7...9becc61)

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

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

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

Author: dependabot[bot]

.github/workflows/release.yml

@@ -25,7 +25,7 @@ jobs:
         go-version: 1.19
         check-latest: true
 
-    - uses: sigstore/cosign-installer@7cc35d7fdbe70d4278a0c96779081e6fac665f88 # v2.7.0
+    - uses: sigstore/cosign-installer@9becc617647dfa20ae7b1151972e9b3a2c338a2b # v2.7.0
     - uses: anchore/sbom-action/download-syft@b5042e9d19d8b32849779bfe17673ff84aec702d # v0.11.0
 
     - name: Install GoReleaser