Build cabal-audit with many ghc versions

add `get-tested` runs. #19

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Run time

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Job	Run time
Generate matrix from cabal	3s
9.4.8 on macos-latest	3m 3s
9.6.4 on macos-latest	3m 5s
9.8.2 on macos-latest	3m 10s
9.4.8 on ubuntu-latest	2m 41s
9.6.4 on ubuntu-latest	2m 56s
9.8.2 on ubuntu-latest	1m 29s
	16m 27s