macos

[DOC] Tweaks for StringIO#isatty #553

Job	Run time
ruby-versions / Generate Ruby versions	5s
macos-13 3.0	1s
macos-13 2.7	1s
macos-13 3.4	1s
macos-13 head	1s
macos-13 3.1	1s
macos-13 3.2	1s
macos-13 3.3	1s
macos-13 jruby-head	1s
macos-14 2.7	40s
macos-13 debug	1s
macos-14 3.0	14s
macos-14 3.1	17s
macos-14 jruby-head	44s
macos-14 debug	19s
macos-14 3.3	16s
macos-14 head	20s
macos-14 3.4	12s
macos-14 3.2	23s
	3m 39s

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