Bump sigstore/cosign-installer from 3.8.0 to 3.8.1

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.8.0 to 3.8.1.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@v3.8.0...v3.8.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

action.yml

@@ -13,7 +13,7 @@ runs:
   using: "composite"
   steps:
     - name: Install Cosign
-      uses: sigstore/cosign-installer@v3.8.0
+      uses: sigstore/cosign-installer@v3.8.1
       with:
         cosign-release: "v2.4.0"