CI: the labeler is not doing it's work anymore

[SMoraisAnsys]

Before submitting the issue

• I have searched among the existing issues
• I am using a Python virtual environment

Description of the bug

Seems like the labeler is not working and I assume it's realted to #3943
From what I've seen in the release note, the file .github/labeler.yml must be modified to match new structure.

Steps To Reproduce

Not needed

Which Operating System are you using?

Windows

Which Python version are you using?

3.7

Installed packages

Not needed