Fix thread safety of strio_free #686

Job	Run time
ruby-versions / Generate Ruby versions	5s
ubuntu-24.04 3.4	48s
ubuntu-24.04 3.2	45s
ubuntu-24.04 3.1	29s
ubuntu-24.04 jruby-head	1m 29s
ubuntu-24.04 debug	45s
ubuntu-24.04 4.0	34s
ubuntu-24.04 3.0	24s
ubuntu-24.04 3.3	42s
ubuntu-24.04 head	38s
ubuntu-22.04 2.7	1m 5s
ubuntu-24.04 truffleruby-head	42s
ubuntu-24.04 2.7	41s
ubuntu-22.04 3.0	23s
ubuntu-22.04 3.1	26s
ubuntu-22.04 3.3	48s
ubuntu-22.04 head	31s
ubuntu-22.04 3.4	44s
ubuntu-22.04 4.0	35s
ubuntu-22.04 truffleruby-head	49s
ubuntu-22.04 jruby-head	5m 55s
ubuntu-22.04 debug	33s
ubuntu-22.04 3.2	49s
	20m 40s

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