change default header to `node` #11175

Job	Run time
Test / prepare-node-matrix	6s
Test / test (18, ubuntu-latest)	5m 34s
Test / test (18, windows-latest)	4m 41s
Test / test (16, ubuntu-latest)	3m 58s
Test / test (14, ubuntu-latest)	3m 22s
Test / test (20, ubuntu-latest, experimental)	4m 49s
Test / test (20, windows-latest, experimental)	5m 54s
Test / test (16.8, ubuntu-latest)	4m 23s
automerge	0s
	32m 47s

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