Ruby

Fix CI #6948

Job	Run time
C99_compile (3.4)	49s
valgrind	1h 0m 26s
C99_compile (head)	1m 37s
test (3.1, test)	3m 5s
test (3.2, test)	2m 52s
test (3.3, test)	3m 34s
test (3.4, test)	3m 13s
test (head, test)	3m 45s
test (head, stdlib_test rubocop)	3m 9s
test (3.4, stdlib_test)	2m 22s
test (3.4, test, --enable-frozen-string-literal)	3m 27s
test (3.4, stdlib_test, --enable-frozen-string-literal)	2m 17s
test (3.4, rubocop validate test_doc build test_generate_stdlib raap)	2m 53s
test (3.4, typecheck_test)	1m 12s
	1h 34m 41s

Provide feedback