Run tests / chore: remove simplejson dependencies (#2968) #2277

Job	Run time
test-windows-full (windows-11-arm)	30m 17s
test-windows-full (windows-latest)	46m 36s
test-pack	4m 7s
test-linux (ubuntu-24.04-arm)	48m 49s
test-windows-core (windows-latest)	1h 9m 34s
test-windows-core (windows-11-arm)	54m 50s
spellcheck-docs	17s
test-macos (arm64)	1h 15m 37s
test-linux (ubuntu-latest)	57m 33s
test-macos (x64)	1h 34m 4s
	8h 1m 44s

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