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

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

Author: renovate[bot]

.github/workflows/solidity.yml

@@ -273,7 +273,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Install Cosign
-        uses: sigstore/cosign-installer@v3
+        uses: sigstore/cosign-installer@v4
 
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3