Add nixpkgs-2505 (#2377) #3176

Job	Run time
cabal-doExactConfig	14s
maintainer-scripts	8s
build-extra-hackages	10s
cabal	15s
multi-target	34s
nix-build	55s
plan-extra-hackages	10s
runghc	13s
shellFor-hoogle	14s
shellFor-multiple-package	18s
shellFor-not-depends	19s
shellFor-single-package	21s
tests-benchmarks	11s
unit-tests	8s
check-materialization-concurrency	22s
check-path-support	8s
closure-size	8s
docs	4m 35s
haskell-nix-roots-do-not-require-IFDs	24s
hix	46s
hix-cabal	3m 9s
hydra-ifdLevel-0-and-1	3m 8s
hydra-ifdLevel-2	9m 58s
hydra-ifdLevel-3	30m 16s
hydra-without-remote-builders-ghc9102	56s
hydra-without-remote-builders-ghc967	3m 10s
update-docs	9s
nix-tools	1m 58s
	1h 3m 17s

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