Fix concurrent test suite interference #348

Job	Run time
notify-tests (macos-latest)	23m 39s
cabal (9.6.5, macos-latest)	17m 23s
lint	3m 55s
cabal (9.6.5, ubuntu-latest)	19m 11s
nix (macos-latest)	23m 3s
cabal (9.8.2, --project-file cabal.ghc982.project, macos-latest)	18m 45s
stack (macos-latest, false)	15m 51s
nix (ubuntu-latest)	24m 8s
cabal (9.8.2, --project-file cabal.ghc982.project, ubuntu-latest)	17m 41s
stack (ubuntu-latest, true)	13m 21s
cabal (9.10.1, macos-latest)	22m 59s
cabal (9.10.1, ubuntu-latest)	19m 39s
release_linux_static	0s
release_linux	0s
release_osx	0s
merge	0s
	3h 39m 35s

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