Bump kentaro-m/auto-assign-action from 1.1.2 to 1.2.1

Bumps [kentaro-m/auto-assign-action](https://github.com/kentaro-m/auto-assign-action) from 1.1.2 to 1.2.1.
- [Release notes](https://github.com/kentaro-m/auto-assign-action/releases)
- [Commits](kentaro-m/auto-assign-action@v1.1.2...v1.2.1)

---
updated-dependencies:
- dependency-name: kentaro-m/auto-assign-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/pr.yml

@@ -14,6 +14,6 @@ jobs:
           java-version: '11'
       - name: Run with Gradle
         run: ./gradlew clean test --info
-      - uses: kentaro-m/auto-assign-action@v1.1.2
+      - uses: kentaro-m/auto-assign-action@v1.2.1
         with:
           configuration-path: ".github/auto_assign.yml"