Bump docker/build-push-action from 5.4.0 to 6.1.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5.4.0 to 6.1.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@ca052bb...31159d4)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/container.yml

@@ -45,7 +45,7 @@ jobs:
 
       - name: Build Docker image (PCW)
         if: ${{ matrix.suffix == 'main' }}
-        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25
+        uses: docker/build-push-action@31159d49c0d4756269a0940a750801a1ea5d7003
         with:
           context: .
           file: containers/Dockerfile
@@ -54,7 +54,7 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
       - name: Build Docker image (K8S)
         if: ${{ matrix.suffix == 'k8s' }}
-        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25
+        uses: docker/build-push-action@31159d49c0d4756269a0940a750801a1ea5d7003
         with:
           context: .
           file: containers/Dockerfile_${{ matrix.suffix }}
@@ -91,7 +91,7 @@ jobs:
 
       - name: Build and push Docker image (PCW)
         if: ${{ matrix.suffix == 'main' }}
-        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25
+        uses: docker/build-push-action@31159d49c0d4756269a0940a750801a1ea5d7003
         with:
           context: .
           file: containers/Dockerfile
@@ -100,7 +100,7 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
       - name: Build and push Docker image (K8S)
         if: ${{ matrix.suffix == 'k8s' }}
-        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25
+        uses: docker/build-push-action@31159d49c0d4756269a0940a750801a1ea5d7003
         with:
           context: .
           file: containers/Dockerfile_${{ matrix.suffix }}