macos

[DOC] Tweaks for StringIO#fileno #554

Job	Run time
ruby-versions / Generate Ruby versions	4s
macos-13 3.2	1s
macos-13 2.7	1s
macos-13 3.1	1s
macos-13 3.0	1s
macos-13 3.4	1s
macos-13 jruby-head	1s
macos-13 3.3	1s
macos-13 head	1s
macos-14 2.7	38s
macos-13 debug	1s
macos-14 3.1	15s
macos-14 debug	27s
macos-14 3.4	17s
macos-14 3.3	20s
macos-14 3.2	16s
macos-14 jruby-head	36s
macos-14 3.0	15s
macos-14 head	17s
	3m 34s

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