(maint) bump concurrent-ruby version #425

Job	Run time
spec (ruby 2.7) / spec	56s
spec (ruby 3.2) / spec	45s
acceptance (ruby 3.2 \| windows-2019) / acceptance	34m 2s
acceptance (ruby 2.7 \| ubuntu-latest) / acceptance	12m 57s
acceptance (ruby 3.2 \| ubuntu-latest) / acceptance	13m 46s
acceptance (ruby 2.7 \| windows-2019) / acceptance	29m 23s
	1h 31m 49s

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