chore(deps): Bump sigstore/cosign-installer from 3.8.0 to 3.8.1 (#782)

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@c56c2d3...d7d6bc7)

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

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

.github/workflows/release-chart.yaml

@@ -57,7 +57,7 @@ jobs:
           CR_SIGN: true
 
       - name: Install Cosign
-        uses: sigstore/cosign-installer@c56c2d3e59e4281cc41dea2217323ba5694b171e # v3.8.0
+        uses: sigstore/cosign-installer@d7d6bc7722e3daa8354c50bcb52f4837da5e9b6a # v3.8.1
 
       - name: Login to Github Packages
         uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567 # v3.3.0

.github/workflows/release-image.yaml

@@ -61,7 +61,7 @@ jobs:
             ghcr.io/${{github.repository_owner}}/policy-reporter:${{ env.VERSION }}
 
       - name: Install Cosign
-        uses: sigstore/cosign-installer@c56c2d3e59e4281cc41dea2217323ba5694b171e # v3.8.0
+        uses: sigstore/cosign-installer@d7d6bc7722e3daa8354c50bcb52f4837da5e9b6a # v3.8.1
 
       - name: Sign image
         shell: bash