Update entry for Willow Chargin in .mailmap and ACKS

[wchargin]

No description provided.

[wchargin]

I've already updated my bpo profile. You can see my name on my website here to confirm: https://wchargin.com

I think that this should be "skip issue" and "skip news".

Prior art: #103696

[picnixz]

For posterity: https://github.com/python/cpython/commits?author=wchargin and 674935b for the commit that added the original line in ACKS.

[wchargin]

Thank you for the prompt review and merge. @picnixz, a request: I'd prefer if you didn't use my old name in your comment above. Separating myself from that name is the point of this change; I don't want to introduce new search results with the old name, or make it more likely for people who have only known me by my current name to stumble across the old one. Mentioning the original commit is totally fine with me—cross-referencing is good hygiene—but the deadnaming is unnecessary.

Thanks again.

(I tried to send this note by email, but I couldn't find contact info.)

[picnixz]

Sorry for that! I've updated my comment to remove your old name.