CI tests

Bump commonmark-extensions to 0.2.4, update changelog #486

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Run time

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Job	Run time
windows	17m 35s
linux (8.10, 3.2)	2m 7s
linux (9.0, 3.4)	2m 33s
linux (9.2, 3.4)	2m 26s
linux (9.4, 3.10)	8m 2s
linux (9.6, 3.10)	7m 38s
	40m 21s