Exclude older than 2.6 on macos-14 #33

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (2.5 / ubuntu-latest)	17s
build (2.5 / windows-latest)	1m 35s
build (2.6 / ubuntu-latest)	18s
build (2.6 / macos-latest)	27s
build (2.6 / windows-latest)	2m 11s
build (2.7 / ubuntu-latest)	19s
build (2.7 / macos-latest)	25s
build (2.7 / windows-latest)	2m 28s
build (3.0 / ubuntu-latest)	8s
build (3.0 / macos-latest)	10s
build (3.0 / windows-latest)	1m 3s
build (3.1 / ubuntu-latest)	5s
build (3.1 / macos-latest)	9s
build (3.1 / windows-latest)	1m 15s
build (3.2 / ubuntu-latest)	6s
build (3.2 / macos-latest)	8s
build (3.2 / windows-latest)	1m 19s
build (3.3 / ubuntu-latest)	5s
build (3.3 / macos-latest)	9s
build (3.3 / windows-latest)	1m 16s
build (head / ubuntu-latest)	6s
build (head / macos-latest)	9s
build (head / windows-latest)	50s
build (jruby / ubuntu-latest)	25s
build (jruby / macos-latest)	16s
build (jruby / windows-latest)	1m 14s
build (jruby-head / ubuntu-latest)	20s
build (jruby-head / macos-latest)	22s
build (jruby-head / windows-latest)	1m 12s
build (truffleruby / ubuntu-latest)	12s
build (truffleruby / macos-latest)	14s
build (truffleruby-head / ubuntu-latest)	17s
build (truffleruby-head / macos-latest)	16s
	19m 49s

Provide feedback