chore!: Remove deprecated "ghc" argument #2813

Job	Run time
cabal	2m 38s
cabal-doExactConfig	2m 35s
runghc	2m 14s
nix-build	8m 55s
build-extra-hackages	2m 6s
maintainer-scripts	1m 51s
multi-target	2m 38s
shellFor-hoogle	2m 31s
shellFor-multiple-package	30s
shellFor-single-package	22s
plan-extra-hackages	6s
tests-benchmarks	29s
check-materialization-concurrency	24s
check-path-support	9s
closure-size	4s
docs	1m 45s
hix	7m 33s
hydra-ifdLevel-0-and-1	8m 12s
hydra-ifdLevel-2	9m 20s
hydra-ifdLevel-3	30m 9s
shellFor-not-depends	14s
update-docs	4s
hix-cabal	5m 46s
haskell-nix-roots-do-not-require-IFDs	1m 18s
hydra-without-remote-builders-ghc8107	2m 31s
hydra-without-remote-builders-ghc9101	2m 10s
nix-tools	1m 48s
unit-tests	6s
	1h 38m 28s

Provide feedback