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/branch.yml

@@ -53,7 +53,7 @@ jobs:
             ~/.bun/install/cache
 
       - name: Install Cosign
-        uses: sigstore/cosign-installer@v3
+        uses: sigstore/cosign-installer@v4
 
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3