chore(ci): Bump actions/labeler from 4 to 5

[yin1999]

Description

Bump actions/labeler from 4 to 5.

The new input: sync-label is added to automatically remove unmatched labels (which is configured in label matching entries)

Motivation

All the actions which is running on Node 16 will be migrated to Node 20. And the actions/labeler@v4 is running on Node 16 which may not be supported in the future.

Related issues and pull requests

#17278
testing: #18403, see debug log.

[yin1999]

/cc @bsmth, @queengooborg

[bsmth]

automatically remove unmatched labels

Will this remove a label that I manually added? Or the automated pr label, will that be removed?

[yin1999]

automatically remove unmatched labels

Will this remove a label that I manually added? Or the automated pr label, will that be removed?

It will not be removed:

According to the sync logic. Only the labels configured in the .github/labeler.yml files would be managed by the labeler (that is the label such as automated pr will not be removed by labeler as it is not configured in the config file)

I've tested this in #18403 by adding the community label and re-run the labeler, and the community label is still there :)

[bsmth]

OK, let's give it a try! Thank you!

[yin1999]

It works well:

• in zh-cn: update the translation of "Relationship of flexbox to other layouts" #18463: I've added two labels (l10n-zh, needs content update). And the labeler did not remove the latter one which is not configured in config file).
• in Web/API/Speculation_Rules_API を新規翻訳 #18462: The labeler correctly added the label

We can now apply the corresponding changes to the mdn/content repository :)