Back to pull request #5391

chore: bump c8 from 8.0.1 to 9.0.0 #1477

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Run time

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Job	Run time
coverage (ubuntu-latest, 14.x)	50s
tester (ubuntu-latest, 14.x)	43s
tester (ubuntu-latest, 16.x)	40s
tester (ubuntu-latest, 18.x)	41s
tester (windows-latest, 14.x)	1m 22s
tester (windows-latest, 16.x)	1m 24s
tester (windows-latest, 18.x)	1m 24s
tester (macos-latest, 14.x)	3m 10s
tester (macos-latest, 16.x)	1m 10s
tester (macos-latest, 18.x)	1m 6s
	12m 30s