bug: Action failed with error "Validation Failed: "

[peaceiris]

Checklist

• [X] I am using the latest version of this action.
• [X] I have read the latest README and followed the instructions.
• [X] I have read the latest GitHub Actions official documentation and learned the basic spec and concepts.
• [X] I have set RUNNER_DEBUG: 1 for debugging.

Describe the bug

https://github.com/peaceiris/actions-gh-pages/runs/5463092772?check_suite_focus=true#step:3:380

Relevant links

YAML config: https://github.com/peaceiris/actions-gh-pages/blob/c921422e3791023a8dd39566a129863ff42e8c39/.github/label-commenter-config.yml
YAML workflow: https://github.com/peaceiris/actions-gh-pages/blob/c921422e3791023a8dd39566a129863ff42e8c39/.github/workflows/label-commenter.yml

Relevant log output

https://github.com/peaceiris/actions-gh-pages/runs/5463092772?check_suite_focus=true#step:3:380

Additional context.

No response