pr_labeler: migrate to minimal typer-slim package for CLI parsing

[gotmax23]

pr_labeler: migrate to minimal typer-slim package for CLI parsing

[gotmax23]

This also applies to hacking/tagger that uses typer for CLI parsing

[x1101]

I was digging into this and and it appears that typer has been migrated to typer-silm everywhere except test/tag.in

@gotmax23 can you confirm that this is now what you're expecting, or point me towards what I'm missing?