Add conditional development dependency on `mutex_m` #76

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Run time

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Job	Run time
test (2.6, false)	27s
test (2.7, false)	23s
test (3.0, false)	11s
test (3.1, false)	13s
test (3.2, false)	11s
test (ruby-head, true)	16s
	1m 41s