Ruby

Bump bigdecimal from 3.1.9 to 3.2.2 #6982

Job	Run time
C99_compile (3.4)	49s
test (3.1, test)	2m 59s
C99_compile (head)	1m 48s
valgrind	51m 42s
test (3.2, test)	2m 56s
test (3.3, test)	3m 16s
test (3.4, test)	3m 6s
test (head, test)	2m 4s
test (head, stdlib_test rubocop)	1m 45s
test (3.4, stdlib_test)	2m 24s
test (3.4, test, --enable-frozen-string-literal)	2m 56s
test (3.4, stdlib_test, --enable-frozen-string-literal)	2m 23s
test (3.4, rubocop validate test_doc build test_generate_stdlib raap)	2m 48s
test (3.4, typecheck_test)	1m 18s
	1h 22m 14s

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