Bump sigstore/cosign-installer from 3.8.0 to 3.8.1 (#230)

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"