chore(deps): Bump docker/build-push-action from 5 to 6 (Finschia#1425)

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

.github/workflows/docker.yml

@@ -33,7 +33,7 @@ jobs:
           tags: |
             type=semver,pattern={{version}}
       - name: docker build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: ${{github.event_name != 'pull_request'}}
           build-args: ARCH=x86_64