chore: PR team labeler

[olivermrbl]

What
Minor quality-of-life improvement for PR reviewing.

Action that adds team label team: medusa to PRs created by team Medusa.

https://github.com/JulienKode/team-labeler-action

We can look into creating our own at some point, but not worth the time right now

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Latest commit: 4e0ccc8

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