Reduce memory in comment #4570

Job	Run time
windows (windows-2019, ucrt)	49s
windows (windows-2019, mswin)	1m 3s
test (3.0, test)	2m 12s
windows (windows-2022, ucrt)	1m 30s
test (3.1, test)	2m 6s
test (3.2, test)	2m 1s
windows (windows-2022, mswin)	1m 52s
test (3.3, test)	2m 24s
test (head, test)	2m 3s
test (head, stdlib_test rubocop)	1m 50s
test (3.3, stdlib_test)	2m 8s
test (3.3, test, --enable-frozen-string-literal)	2m 26s
test (3.3, stdlib_test, --enable-frozen-string-literal)	2m 19s
test (3.3, lexer compile confirm_lexer)	3m 2s
test (3.3, rubocop validate test_doc build test_generate_stdlib)	2m 8s
	29m 53s

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