Ruby

Bump test-unit from 3.6.8 to 3.6.9 in /steep #7123

Job	Run time
C99_compile (3.4)	43s
C99_compile (head)	1m 12s
test (3.2, test)	2m 47s
test (3.3, test)	3m 13s
test (3.4, test)	3m 14s
test (3.4, test, --enable-frozen-string-literal)	3m 6s
test (3.1, test)	3m 0s
test (head, test)	3m 45s
test (3.4, rubocop validate test_doc build test_generate_stdlib raap)	2m 54s
test (head, stdlib_test rubocop)	3m 9s
test (3.4, stdlib_test, --enable-frozen-string-literal)	2m 28s
test (3.4, stdlib_test)	2m 20s
test (3.4, typecheck_test)	1m 16s
	33m 7s

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