Ruby

Bump rbs from 3.9.0 to 3.9.2 in /steep #6572

Job	Run time
valgrind	52m 42s
test (3.1, test)	2m 35s
test (3.2, test)	2m 32s
test (3.3, test)	3m 14s
test (3.4, test)	2m 45s
test (head, test)	3m 27s
test (head, stdlib_test rubocop)	3m 23s
test (3.4, stdlib_test)	1m 57s
test (3.4, test, --enable-frozen-string-literal)	2m 47s
test (3.4, stdlib_test, --enable-frozen-string-literal)	2m 4s
test (3.4, lexer templates compile confirm_lexer confirm_templates)	3m 12s
test (3.4, rubocop validate test_doc build test_generate_stdlib raap)	2m 56s
test (3.4, typecheck_test)	1m 4s
	1h 24m 38s

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