Ruby

Bump connection_pool from 2.4.1 to 2.5.0 in /steep #5946

Job	Run time
test (3.1, test)	2m 30s
test (3.2, test)	3m 16s
test (3.3, test)	2m 40s
test (3.4, test)	2m 27s
test (head, test)	3m 31s
test (head, stdlib_test rubocop)	2m 0s
test (3.4, stdlib_test)	1m 59s
test (3.4, test, --enable-frozen-string-literal)	2m 38s
test (3.4, stdlib_test, --enable-frozen-string-literal)	1m 59s
test (3.4, lexer templates compile confirm_lexer confirm_templates)	3m 0s
test (3.4, rubocop validate test_doc build test_generate_stdlib raap)	2m 15s
test (3.4, typecheck_test)	59s
	29m 14s

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