Update action to use node16 instead of node12

[nightcoding]

As we are getting more and more warnings to update our actions to node16, I found we use your pull-request-comment-trigger which still uses node12.

Please update the action to node16 (PR will follow).

Thanks,
Martin

[nightcoding]

I cannot push a new branch, will fork the repo.

Fore more information, see this blog entry of GitHub: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/