macos

Add RDoc development dependency for Ruby 3.5 or later #398

Job	Run time
ruby-versions / Generate Ruby versions	4s
macos-13 2.7	1m 2s
macos-13 3.0	26s
macos-13 3.1	26s
macos-13 3.2	28s
macos-13 3.3	26s
macos-13 3.4	24s
macos-13 debug	43s
macos-13 head	35s
macos-14 2.7	36s
macos-14 3.0	20s
macos-14 3.1	16s
macos-14 3.2	19s
macos-14 3.3	18s
macos-14 3.4	23s
macos-14 debug	20s
macos-14 head	18s
	7m 24s

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