ci: migrate to actions/create-github-app-token

Author: tasshi-me

Diff for: .github/workflows/release.yml

@@ -10,11 +10,11 @@ jobs:
       release_created: ${{ steps.release.outputs.release_created }}
     runs-on: ubuntu-latest
     steps:
-      - uses: cybozu/octoken-action@c72648d598d172cb5785587f6243bbd09774d034 # v1
+      - uses: actions/create-github-app-token@v1
         id: create-iat
         with:
-          github_app_id: ${{ secrets.RELEASE_GITHUB_APP_ID}}
-          github_app_private_key: ${{ secrets.RELEASE_GITHUB_APP_KEY }}
+          app-id: ${{ secrets.RELEASE_GITHUB_APP_ID }}
+          private-key: ${{ secrets.RELEASE_GITHUB_APP_KEY }}
       - uses: google-github-actions/release-please-action@ca6063f4ed81b55db15b8c42d1b6f7925866342d # v3
         id: release
         with: