🛠️ Bump docker/build-push-action from 5 to 6

Bumps [docker/build-push-action](https://github.com/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
...

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

.github/workflows/trigger_devel.yaml

@@ -92,7 +92,7 @@ jobs:
       - name: Build and push
         if: steps.config.outputs.trigger == 'true'
         id: docker_build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ros2/source/devel
           pull: true

.github/workflows/trigger_nightly.yaml

@@ -92,7 +92,7 @@ jobs:
       - name: Build and push nightly
         if: steps.config.outputs.trigger == 'true'
         id: docker_build_nightly
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ros2/nightly/nightly
           pull: true
@@ -111,7 +111,7 @@ jobs:
       - name: Build and push nightly-rmw
         if: steps.config.outputs.trigger == 'true'
         id: docker_build_nightly-rmw
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ros2/nightly/nightly-rmw
           pull: true
@@ -130,7 +130,7 @@ jobs:
       - name: Build and push nightly-rmw-nonfree
         if: steps.config.outputs.trigger == 'true'
         id: docker_build_nightly-rmw-nonfree
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ros2/nightly/nightly-rmw-nonfree
           pull: true

.github/workflows/trigger_testing.yaml

@@ -92,7 +92,7 @@ jobs:
       - name: Build and push
         if: steps.config.outputs.trigger == 'true'
         id: docker_build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ros2/testing/testing
           pull: true