fix: it-foreach should only await thenables #122

Job	Run time
check	4m 36s
test-node (windows-latest, lts/*)	5m 28s
test-chrome	12s
test-node (ubuntu-latest, lts/*)	12s
test-node (macos-latest, lts/*)	3m 22s
test-firefox	15s
test-chrome-webworker	21s
test-electron-main	13s
test-electron-renderer	20s
test-webkit (ubuntu-latest, lts/*)	30s
test-webkit-webworker (ubuntu-latest, lts/*)	15s
test-webkit (macos-latest, lts/*)	2m 39s
test-webkit-webworker (macos-latest, lts/*)	3m 10s
test-firefox-webworker	11s
release	0s
	21m 44s

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