chore(deps): update sigstore/cosign-installer action to v4 (#79)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/docker.yaml

@@ -110,7 +110,7 @@ jobs:
         run: |
           DIGEST=$(docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }} --format "{{ print .Manifest.Digest }}")
           echo "digest=$DIGEST" >> "$GITHUB_OUTPUT"
-      - uses: sigstore/cosign-installer@d7543c93d881b35a8faa02e8e3605f69b7a1ce62 # v3.10.0
+      - uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad # v4.0.0
       - name: Sign the images with GitHub OIDC Token
         env:
           DIGEST: ${{ steps.digest.outputs.digest }}