Bump docker/build-push-action from 6 to 7 (#5765)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6 to 7.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v6...v7)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/docker.yml

@@ -82,7 +82,7 @@ jobs:
 
       - name: Build Docker image (main architectures)
         id: build_main_arches
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           file: .github/docker/Dockerfile
@@ -97,7 +97,7 @@ jobs:
 
       - name: Build Docker image (additional architectures)
         id: build_additional_arches
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           file: .github/docker/Dockerfile.usa