Welcome Oleg (sharlatan) as a new committer

[Maxim Cournoyer]

Hello Guix!

I'm happy to start the 2024 year with a new committer onboard: Sharlatan
(Oleg).

Sharlatan is maintaining a growing collection of astronomy packages in
Guix, among others.

Let's Wish them a warm welcome!

-- 
Thanks,
Maxim