Ruby

Bump bigdecimal from 3.1.9 to 3.2.0 in /steep #6934

Job	Run time
C99_compile (3.4)	1m 3s
C99_compile (head)	1m 25s
test (3.1, test)	2m 58s
test (3.2, test)	2m 54s
valgrind	52m 19s
test (3.3, test)	3m 10s
test (3.4, test)	3m 7s
test (head, test)	3m 31s
test (head, stdlib_test rubocop)	3m 16s
test (3.4, stdlib_test)	2m 17s
test (3.4, test, --enable-frozen-string-literal)	3m 4s
test (3.4, stdlib_test, --enable-frozen-string-literal)	2m 21s
test (3.4, rubocop validate test_doc build test_generate_stdlib raap)	2m 58s
test (3.4, typecheck_test)	1m 10s
	1h 25m 33s

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