Bump docker/build-push-action from 6.3.0 to 6.4.0 (#108)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.3.0 to 6.4.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@1a16264...a254f8c)

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

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

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
           install: true
 
       - name: Build Docker image and store in cache
-        uses: docker/build-push-action@1a162644f9a7e87d8f4b053101d1d9a712edc18c
+        uses: docker/build-push-action@a254f8ca60a858f3136a2f1f23a60969f2c402dd
         with:
           context: .
           push: false