Bump docker/build-push-action from 6.15.0 to 6.18.0 (#144)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.15.0 to 6.18.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@471d1dc...2634353)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: 6.18.0
  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

@@ -55,7 +55,7 @@ jobs:
           install: true
 
       - name: Build Docker image and store in cache
-        uses: docker/build-push-action@471d1dc4e07e5cdedd4c2171150001c434f0b7a4
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83
         with:
           context: .
           push: false