Tests

Bump dessant/lock-threads from 4 to 5 #1694

Job	Run time
build	6m 9s
check_links	2m 30s
check_release	4m 32s
JS (ubuntu-latest, chrome-headless)	2m 41s
JS (ubuntu-latest, firefox-headless)	2m 53s
JS (windows-latest, chrome-headless)	5m 58s
JS (windows-latest, firefox-headless)	5m 32s
JS (windows-latest, webkit-headless)	5m 35s
JS (macos-latest, chrome-headless)	6m 26s
JS (macos-latest, firefox-headless)	5m 3s
JS (macos-latest, webkit-headless)	7m 39s
	54m 58s

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