Update npm packages for 6.4.2 #204

Job	Run time
Core running from build / Core running from build / Linux	2m 19s
Core running from src / Core running from src / Windows	4m 7s
Core running from src / Core running from src / Linux	4m 21s
Core running from build / Core running from build / Windows	3m 51s
Core running from build / Core running from build / MacOS	6m 0s
Core running from src / Core running from src / MacOS	3m 38s
Gutenberg running from src / Gutenberg running from src / Linux	10m 31s
Gutenberg running from build / Gutenberg running from build / Linux	13m 28s
Gutenberg running from build / Gutenberg running from build / Windows	10m 55s
Gutenberg running from build / Gutenberg running from build / MacOS	12m 52s
Gutenberg running from src / Gutenberg running from src / MacOS	17m 3s
Gutenberg running from src / Gutenberg running from src / Windows	11m 18s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 40m 23s

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