Bump activesupport from 7.2.0 to 7.2.1 in /steep #5193

Job	Run time
test (3.0, test)	2m 30s
test (3.1, test)	2m 14s
test (3.2, test)	2m 13s
test (3.3, test)	2m 22s
test (head, test)	2m 9s
test (head, stdlib_test rubocop)	1m 55s
test (3.3, stdlib_test)	2m 10s
test (3.3, test, --enable-frozen-string-literal)	2m 23s
test (3.3, stdlib_test, --enable-frozen-string-literal)	2m 13s
test (3.3, lexer compile confirm_lexer)	3m 9s
test (3.3, rubocop validate test_doc build test_generate_stdlib raap)	2m 29s
test (3.3, typecheck_test)	1m 0s
	26m 47s

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