Bump actions/setup-java from 4 to 5 #485

Job	Run time
ruby-versions / Generate Ruby versions	5s
ubuntu-24.04 3.0	18s
ubuntu-24.04 3.4	15s
ubuntu-24.04 3.3	21s
ubuntu-24.04 3.2	18s
ubuntu-24.04 3.1	16s
ubuntu-24.04 truffleruby-head	25s
ubuntu-24.04 debug	23s
ubuntu-24.04 head	11s
ubuntu-22.04 2.7	42s
ubuntu-24.04 jruby-head	1m 6s
ubuntu-24.04 2.7	46s
ubuntu-22.04 3.3	16s
ubuntu-22.04 3.1	31s
ubuntu-22.04 3.2	19s
ubuntu-22.04 debug	27s
ubuntu-22.04 3.4	14s
ubuntu-22.04 3.0	12s
ubuntu-22.04 truffleruby-head	23s
ubuntu-22.04 jruby-head	1m 8s
ubuntu-22.04 head	14s
	8m 50s

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