Merging branch wip-haskell

[Lars-Dominik Braun]

Hi,

just a heads-up: The long overdue Haskell update is finally rolling in,
bumping our packages to Stackage release 20.5 and the compiler to 9.2. The
corresponding issue is #61420.

Is there anything preventing a merge into currently? Can we coordinate
the merge with some other big world-rebuilding changes waiting to happen
(apart from core-updates)?

Cheers,
Lars