Build GHC in GHC2021

[Arnaud Spiwack]

Dear GHC devs,

Year 2024 is upon us. GHC2021 was released 2 years ago, in GHC 9.2. I think
it's time for the base language for GHC to be GHC2021.

What do we think?

PS: I don't actually know where the base language for GHC is specified. I
couldn't find it with a cursory search
PPS: if someone makes an MR, bonus points for clearing up hundreds of lines
of now-unnecessary extension on top of files.

-- 
Arnaud Spiwack
Director, Research at https://moduscreate.com and https://tweag.io.
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