Use `hls-2.10` #3039

Job	Run time
nix-build	8m 40s
runghc	14s
cabal	19s
build-extra-hackages	16s
cabal-doExactConfig	1m 23s
unit-tests	5s
hix	1m 51s
multi-target	48s
maintainer-scripts	34s
plan-extra-hackages	5s
shellFor-hoogle	14s
shellFor-multiple-package	15s
shellFor-not-depends	17s
shellFor-single-package	1m 9s
tests-benchmarks	10s
check-path-support	8s
check-materialization-concurrency	20s
closure-size	3s
docs	1m 51s
haskell-nix-roots-do-not-require-IFDs	1m 57s
hix-cabal	12s
hydra-ifdLevel-0-and-1	3m 52s
hydra-ifdLevel-2	20m 13s
hydra-ifdLevel-3	30m 16s
hydra-without-remote-builders-ghc9101	5m 4s
hydra-without-remote-builders-ghc967	4m 18s
nix-tools	11s
update-docs	4s
	1h 24m 49s

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