Ruby

Bump json from 2.7.2 to 2.7.6 in /steep #5488

Job	Run time
test (3.1, test)	2m 44s
test (3.2, test)	2m 14s
test (3.3, test)	2m 28s
test (head, test)	2m 9s
test (head, stdlib_test rubocop)	1m 46s
test (3.3, stdlib_test)	2m 7s
test (3.3, test, --enable-frozen-string-literal)	2m 26s
test (3.3, stdlib_test, --enable-frozen-string-literal)	2m 8s
test (3.3, lexer compile confirm_lexer)	3m 0s
test (3.3, rubocop validate test_doc build test_generate_stdlib raap)	2m 27s
test (3.3, typecheck_test)	1m 0s
	24m 29s

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