Update sigstore/cosign-installer action to v4 (#305)

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

Author: renovate[bot]

.github/workflows/ci-pipeline.yml

@@ -127,7 +127,7 @@ jobs:
       # Install the cosign tool
       # https://github.com/sigstore/cosign-installer
       - name: Install cosign
-        uses: sigstore/cosign-installer@v3.10.0
+        uses: sigstore/cosign-installer@v4.0.0
 
       - name: Setup Docker buildx
         uses: docker/setup-buildx-action@v3.11.1
@@ -229,7 +229,7 @@ jobs:
       # Install the cosign tool
       # https://github.com/sigstore/cosign-installer
       - name: Install cosign
-        uses: sigstore/cosign-installer@v3.10.0
+        uses: sigstore/cosign-installer@v4.0.0
 
       - name: Setup Docker buildx
         uses: docker/setup-buildx-action@v3.11.1