proper isNode detection for node v21.0.0 #377

Job	Run time
lint	1m 25s
build	1m 24s
test-api-parallel (18, ubuntu, chromium)	3m 4s
test-playwright-parallel (18, ubuntu, chromium)	2m 48s
test-api-parallel (18, ubuntu, firefox)	3m 30s
test-playwright-parallel (18, ubuntu, firefox)	3m 5s
test-unit-parallel (18, ubuntu)	2m 3s
test-playwright-parallel (18, ubuntu, webkit)	2m 50s
test-unit-parallel (18, macos)	2m 38s
test-unit-parallel (18, windows)	9m 32s
test-unit-coverage	1m 14s
test-unit (16, ubuntu)	59s
test-api (18, windows, chromium)	8m 42s
test-unit (16, macos)	2m 7s
test-api (18, windows, firefox)	8m 54s
test-unit (16, windows)	6m 29s
	1h 0m 44s

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