Ruby

Add no-milestone label to dependabot configuration #7999

Job	Run time
C99_compile (4.0)	53s
C99_compile (head)	48s
test (asan-release, test)	7m 45s
test (3.2, test)	2m 21s
test (4.0, stdlib_test)	1m 53s
test (head, test)	2m 10s
test (4.0, stdlib_test, --enable-frozen-string-literal)	1m 56s
test (4.0, typecheck_test)	1m 14s
test (4.0, rubocop validate test_doc build test_generate_stdlib raap)	2m 31s
test (4.0, test, --enable-frozen-string-literal)	2m 24s
test (3.4, test)	2m 34s
test (3.3, test)	2m 35s
test (4.0, test)	2m 29s
test (head, stdlib_test rubocop)	1m 55s
	33m 28s

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