Bump docker/build-push-action from 3 to 6

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 3 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v3...v6)

---
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>

Author: dependabot[bot]

.github/workflows/docker-publish.yml

@@ -18,31 +18,31 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Build Central System 1.6 example
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           push: true
           tags: ldonini/ocpp1.6-central-system:latest
           file: example/1.6/cs/Dockerfile
           platforms: linux/amd64,linux/arm64
           context: .
       - name: Build Charge Point 1.6 example
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           push: true
           tags: ldonini/ocpp1.6-charge-point:latest
           file: example/1.6/cp/Dockerfile
           platforms: linux/amd64,linux/arm64
           context: .
       - name: Build CSMS 2.0.1 example
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           push: true
           tags: ldonini/ocpp2.0.1-csms:latest
           file: example/2.0.1/csms/Dockerfile
           platforms: linux/amd64,linux/arm64
           context: .
       - name: Build Charging Station 2.0.1 example
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           push: true
           tags: ldonini/ocpp2.0.1-charging-station:latest

.github/workflows/release.yml

@@ -17,29 +17,29 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Release Central System 1.6 example
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           push: true
           tags: ldonini/ocpp1.6-central-system:${{ github.event.release.tag_name }}
           file: example/1.6/cs/Dockerfile
           context: .
       - name: Release Charge Point 1.6 example
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           push: true
           tags: ldonini/ocpp1.6-charge-point:${{ github.event.release.tag_name }}
           file: example/1.6/cp/Dockerfile
           context: .
       - name: Release CSMS 2.0.1 example
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           push: true
           tags: ldonini/ocpp2.0.1-csms:${{ github.event.release.tag_name }}
           file: example/2.0.1/csms/Dockerfile
           platforms: linux/amd64,linux/arm64
           context: .
       - name: Release charging station 2.0.1 example
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           push: true
           tags: ldonini/ocpp2.0.1-charging-station:${{ github.event.release.tag_name }}