Switch to a released version of commonmarker with support for Ruby 4.x #1638

Job	Run time
benchmark-graph	48s
benchmark-ractor-only (head)	39s
benchmark-run-once	1m 59s
benchmark-ractor (head)	6m 54s
benchmark-default (head)	15m 54s
benchmark-default (truffleruby)	14m 21s
test (truffleruby)	1m 32s
test (ruby)	59s
test (head)	53s
benchmark-default (ruby)	13m 23s
all-tests	2s
	57m 24s

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