Bump docker/build-push-action from 2 to 6

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v2...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/integration-testing.yml

@@ -38,7 +38,7 @@ jobs:
             ${{ runner.os }}-buildx-
 
       - name: Build and Push Integration Test App Docker Image to ECR
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v6
         with:
           context: integration-test-app
           push: true