Update tests to haskell-language-server 2.7 #2042

Job	Run time
cabal	1m 11s
nix-build	55m 49s
runghc	1m 8s
unit-tests	18s
build-extra-hackages	28s
cabal-doExactConfig	42s
docs	2m 11s
hix	3m 55s
maintainer-scripts	31s
multi-target	2m 8s
plan-extra-hackages	23s
shellFor-hoogle	1m 8s
shellFor-not-depends	51s
shellFor-single-package	49s
shellFor-multiple-package	40s
tests-benchmarks	47s
check-materialization-concurrency	29s
check-path-support	1m 31s
haskell-nix-roots-do-not-require-IFDs	22s
closure-size	11s
hydra-ifdLevel-0-and-1	1m 36s
hydra-ifdLevel-2	37s
hydra-ifdLevel-3-and-ghc-9-2	41s
hydra-ifdLevel-3-and-ghc-8-10	59s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	47s
update-docs	13s
hix-cabal	16m 42s
nix-tools	2m 40s
hydra-without-remote-builders	17m 20s
	1h 57m 7s

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