test: fix Fetch/HTTP2 tests #11117

Job	Run time
Test / prepare-node-matrix	3s
Test / prepare-node-matrix	3s
Test / test (18, ubuntu-latest)	5m 12s
Test / test (18, ubuntu-latest)	5m 12s
Test / test (18, windows-latest)	9m 22s
Test / test (18, windows-latest)	9m 22s
Test / test (16, ubuntu-latest)	3m 7s
Test / test (16, ubuntu-latest)	4m 26s
Test / test (14, ubuntu-latest)	2m 50s
Test / test (14, ubuntu-latest)	2m 50s
Test / test (20, ubuntu-latest, experimental)	4m 25s
Test / test (20, ubuntu-latest, experimental)	4m 25s
Test / test (20, windows-latest, experimental)	5m 1s
Test / test (20, windows-latest, experimental)	5m 1s
Test / test (16.8, ubuntu-latest)	4m 4s
Test / test (16.8, ubuntu-latest)	4m 4s
automerge	0s
automerge	0s
	1h 9m 27s

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