Update docker/build-push-action action to v6

Author: renovate[bot]

.github/workflows/build-bundle.yml

@@ -72,7 +72,7 @@ jobs:
 
 
       - name: Build and push bundle image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Containerfile.bundle

.github/workflows/build-catalog.yml

@@ -100,7 +100,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push catalog image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Containerfile.catalog