Bump csv from 3.3.1 to 3.3.2 in /steep #5871

Job	Run time
test (3.1, test)	2m 24s
test (3.2, test)	2m 23s
test (3.3, test)	2m 44s
test (3.4.0-rc1, test)	2m 24s
test (head, test)	2m 34s
test (head, stdlib_test rubocop)	2m 18s
test (3.4.0-rc1, stdlib_test)	1m 49s
test (3.4.0-rc1, test, --enable-frozen-string-literal)	2m 22s
test (3.4.0-rc1, stdlib_test, --enable-frozen-string-literal)	2m 0s
test (3.4.0-rc1, lexer templates compile confirm_lexer confirm_templates)	3m 1s
test (3.4.0-rc1, rubocop validate test_doc build test_generate_stdlib raap)	2m 14s
test (3.4.0-rc1, typecheck_test)	55s
	27m 8s

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