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Bump actions/setup-java from 5 to 6 #688

Job	Run time
ruby-versions / Generate Ruby versions	5s
ubuntu-24.04 2.7	52s
ubuntu-24.04 debug	39s
ubuntu-24.04 3.1	20s
ubuntu-24.04 4.0	30s
ubuntu-24.04 3.4	41s
ubuntu-24.04 3.2	50s
ubuntu-24.04 3.3	43s
ubuntu-24.04 3.0	22s
ubuntu-22.04 debug	40s
ubuntu-24.04 jruby-head	1m 27s
ubuntu-24.04 truffleruby-head	42s
ubuntu-22.04 head	34s
ubuntu-22.04 jruby-head	1m 39s
ubuntu-22.04 3.2	46s
ubuntu-22.04 3.4	49s
ubuntu-22.04 4.0	36s
ubuntu-22.04 2.7	56s
ubuntu-24.04 head	32s
ubuntu-22.04 3.1	22s
ubuntu-22.04 3.3	49s
ubuntu-22.04 truffleruby-head	37s
ubuntu-22.04 3.0	22s
	15m 53s