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] <[email protected]>

.github/workflows/ci-app.yml

@@ -93,7 +93,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: docker build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: src
           cache-from: type=gha

.github/workflows/deploy.yml

@@ -231,7 +231,7 @@ jobs:
           ECR_REGISTRY: ${{ steps.login-ecr.outputs.registry }}
           ECR_REPO: ${{ matrix.env.ecr_repo_name }}
           IMAGE_TAG: ${{ steps.date.outputs.timestamp }}
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: src
           push: true