Deps: Bump docker/build-push-action from 5 to 6 in the actions group

Bumps the actions group with 1 update: [docker/build-push-action](https://github.com/docker/build-push-action).


Updates `docker/build-push-action` from 5 to 6
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5...v6)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/container-doxgen.yml

@@ -51,7 +51,7 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Build and push Container image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: doxygen
           push: ${{ github.event_name != 'pull_request' }}

.github/workflows/container-gpg-data.yml

@@ -51,7 +51,7 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Build and push Container image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: gpg-data
           push: ${{ github.event_name != 'pull_request' }}

.github/workflows/container-mqtt-broker.yml

@@ -51,7 +51,7 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Build and push Container image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: mqtt-broker
           push: ${{ github.event_name != 'pull_request' }}

.github/workflows/container-redis-server.yml

@@ -58,7 +58,7 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Build and push Container image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: redis-server
           push: ${{ github.event_name != 'pull_request' }}