chore(deps): update sigstore/cosign-installer action to v3.8.1

Author: renovate[bot]

.github/workflows/on-push.yml

@@ -64,7 +64,7 @@ jobs:
 
       - name: Install cosign
         if: github.event_name != 'pull_request'
-        uses: sigstore/cosign-installer@6e04d228eb30da1757ee4e1dd75a0ec73a653e06 #v3.1.1
+        uses: sigstore/cosign-installer@d7d6bc7722e3daa8354c50bcb52f4837da5e9b6a # v3.8.1
         with:
           cosign-release: 'v2.1.1'