Lower font-weight values for headings #13610

Job	Run time
Core running from build / Core running from build / Linux	2m 13s
Core running from src / Core running from src / Linux	1m 57s
Core running from build / Core running from build / Windows	4m 4s
Core running from src / Core running from src / Windows	4m 19s
Core running from build / Core running from build / MacOS	2m 23s
Core running from src / Core running from src / MacOS	1m 42s
Gutenberg running from build / Gutenberg running from build / Linux	8m 48s
Gutenberg running from src / Gutenberg running from src / Linux	8m 53s
Gutenberg running from build / Gutenberg running from build / Windows	11m 39s
Gutenberg running from src / Gutenberg running from src / Windows	12m 34s
Gutenberg running from build / Gutenberg running from build / MacOS	7m 23s
Gutenberg running from src / Gutenberg running from src / MacOS	7m 36s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 13m 31s

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