Update docker/build-push-action action to v6

Author: renovate[bot]

.github/workflows/container-scan-trivy.yml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./images/openscap/Dockerfile
@@ -45,7 +45,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./build/Dockerfile

.github/workflows/test-broken-content-latest.yml

@@ -64,7 +64,7 @@ jobs:
 
       - name: Build container images and push
         id: docker_build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: images/testcontent/broken-content.Dockerfile