Bump actions/setup-java from 4 to 5 #486

Job	Run time
ruby-versions / Generate Ruby versions	5s
ubuntu-24.04 3.1	12s
ubuntu-24.04 2.7	42s
ubuntu-24.04 3.4	20s
ubuntu-24.04 debug	26s
ubuntu-24.04 head	17s
ubuntu-24.04 3.0	13s
ubuntu-24.04 jruby-head	1m 2s
ubuntu-24.04 3.3	19s
ubuntu-22.04 2.7	44s
ubuntu-24.04 3.2	20s
ubuntu-22.04 3.0	15s
ubuntu-22.04 3.3	21s
ubuntu-22.04 3.2	22s
ubuntu-24.04 truffleruby-head	22s
ubuntu-22.04 3.4	18s
ubuntu-22.04 truffleruby-head	21s
ubuntu-22.04 debug	21s
ubuntu-22.04 3.1	22s
ubuntu-22.04 head	11s
ubuntu-22.04 jruby-head	1m 1s
	8m 34s

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