Exclude 2.3-2.5 on macos-14 iamge #496

Job	Run time
ruby-versions / Generate Ruby versions	7s
test (ubuntu-latest, 2.3)	43s
test (ubuntu-latest, 2.4)	43s
test (ubuntu-latest, 2.5)	38s
test (ubuntu-latest, 2.6)	42s
test (ubuntu-latest, 2.7)	44s
test (ubuntu-latest, 3.0)	16s
test (ubuntu-latest, 3.1)	22s
test (ubuntu-latest, 3.2)	18s
test (ubuntu-latest, 3.3)	20s
test (ubuntu-latest, head)	20s
test (ubuntu-latest, jruby)	4m 23s
test (ubuntu-latest, jruby-head)	4m 12s
test (ubuntu-latest, truffleruby)	52s
test (windows-latest, 2.3)	1m 41s
test (windows-latest, 2.4)	2m 1s
test (windows-latest, 2.5)	2m 20s
test (windows-latest, 2.6)	2m 29s
test (windows-latest, 2.7)	4m 15s
test (windows-latest, 3.0)	1m 25s
test (windows-latest, 3.1)	1m 22s
test (windows-latest, 3.2)	2m 34s
test (windows-latest, 3.3)	2m 23s
test (windows-latest, head)	1m 19s
	36m 29s

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