Bump kentaro-m/auto-assign-action from 1.2.5 to 2.0.0

Bumps [kentaro-m/auto-assign-action](https://github.com/kentaro-m/auto-assign-action) from 1.2.5 to 2.0.0.
- [Release notes](https://github.com/kentaro-m/auto-assign-action/releases)
- [Commits](kentaro-m/auto-assign-action@v1.2.5...v2.0.0)

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

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

.github/workflows/auto-assign.yml

@@ -10,6 +10,6 @@ jobs:
   add-reviewers:
     runs-on: ubuntu-latest
     steps:
-      - uses: kentaro-m/auto-assign-action@v1.2.5
+      - uses: kentaro-m/auto-assign-action@v2.0.0
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}