Ruby

Bump rdoc from 6.4.0 to 6.6.1 #4196

Job	Run time
windows (windows-2019, ucrt)	50s
test (master-nightly-focal, test)	2m 21s
windows (windows-2019, mswin)	1m 7s
test (master-nightly-focal, stdlib_test)	2m 31s
windows (windows-2022, ucrt)	1m 42s
test (master-nightly-focal, rubocop validate test_doc build test_generate_stdlib)	2m 22s
windows (windows-2022, mswin)	1m 47s
test (master-nightly-focal, lexer confirm_lexer)	3m 11s
test (master-nightly-focal, lexer compile)	3m 22s
test (3.2-dev-focal, test)	2m 9s
test (3.2-dev-focal, stdlib_test)	2m 2s
test (3.2-dev-focal, rubocop validate test_doc build test_generate_stdlib)	1m 58s
test (3.2-dev-focal, lexer confirm_lexer)	3m 12s
test (3.2-dev-focal, lexer compile)	3m 18s
test (3.1-dev-focal, test)	2m 19s
test (3.1-dev-focal, rubocop validate test_doc build test_generate_stdlib)	2m 2s
test (3.1-dev-focal, lexer confirm_lexer)	3m 28s
test (3.1-dev-focal, lexer compile)	3m 14s
test (3.0-dev-focal, test)	2m 13s
test (3.0-dev-focal, rubocop validate test_doc build test_generate_stdlib)	2m 12s
test (3.0-dev-focal, lexer confirm_lexer)	3m 11s
test (3.0-dev-focal, lexer compile)	3m 29s
	54m 0s

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