CI: macos-13 for Ruby 2.5 #131

Job	Run time
ruby-versions / Generate Ruby versions	4s
build (2.5 / ubuntu-latest)	21s
build (2.5 / windows-latest)	1m 31s
build (2.6 / ubuntu-latest)	18s
build (2.6 / macos-latest)	26s
build (2.6 / windows-latest)	2m 17s
build (2.7 / ubuntu-latest)	19s
build (2.7 / macos-latest)	23s
build (2.7 / windows-latest)	2m 13s
build (3.0 / ubuntu-latest)	8s
build (3.0 / macos-latest)	9s
build (3.0 / windows-latest)	40s
build (3.1 / ubuntu-latest)	5s
build (3.1 / macos-latest)	12s
build (3.1 / windows-latest)	58s
build (3.2 / ubuntu-latest)	8s
build (3.2 / macos-latest)	8s
build (3.2 / windows-latest)	56s
build (3.3 / ubuntu-latest)	8s
build (3.3 / macos-latest)	8s
build (3.3 / windows-latest)	1m 5s
build (head / ubuntu-latest)	8s
build (head / macos-latest)	8s
build (head / windows-latest)	59s
build (2.5 / macos-13)	50s
	14m 42s

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