Bump docker/build-push-action from 6.6.1 to 6.7.0 (exercism#208)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.6.1 to 6.7.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@16ebe77...5cd11c3)

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

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

Author: dependabot[bot]

.github/workflows/test.yml

@@ -37,7 +37,7 @@ jobs:
           install: true
 
       - name: Build Docker image and store in cache
-        uses: docker/build-push-action@16ebe778df0e7752d2cfcbd924afdbbd89c1a755
+        uses: docker/build-push-action@5cd11c3a4ced054e52742c5fd54dca954e0edd85
         with:
           context: .
           push: false