Add upper bound on iserv-proxy:network #3321

Job	Run time
nix-build	17m 11s
unit-tests	36s
plan-extra-hackages	1m 13s
cabal-doExactConfig	1m 52s
tests-benchmarks	20s
cabal	1m 32s
shellFor-single-package	1m 51s
multi-target	3m 51s
runghc	40s
shellFor-hoogle	1m 5s
shellFor-multiple-package	1m 5s
maintainer-scripts	14s
shellFor-not-depends	32s
docs	20m 28s
hydra-without-remote-builders-ghc967	5m 5s
hix-cabal	8m 49s
closure-size	8s
hix	2m 27s
hydra-ifdLevel-2	20m 18s
check-path-support	33s
check-materialization-concurrency	26s
hydra-ifdLevel-0-and-1	7m 37s
hydra-without-remote-builders-ghc9102	4m 22s
build-extra-hackages	14s
hydra-ifdLevel-3	30m 19s
update-docs	10s
haskell-nix-roots-do-not-require-IFDs	21s
check-nix-tools	2m 3s
	2h 15m 22s

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