Bump docker/build-push-action from 5 to 6

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5...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>

Author: dependabot[bot]

.github/workflows/test.yml

@@ -34,7 +34,7 @@ jobs:
         if: contains(matrix.os, 'ubuntu')
         with:
           install: true
-      - uses: 'docker/build-push-action@v5'
+      - uses: 'docker/build-push-action@v6'
         if: contains(matrix.os, 'ubuntu')
         with:
           context: .
@@ -76,7 +76,7 @@ jobs:
         if: contains(matrix.os, 'ubuntu')
         with:
           install: true
-      - uses: 'docker/build-push-action@v5'
+      - uses: 'docker/build-push-action@v6'
         if: contains(matrix.os, 'ubuntu')
         with:
           context: .