Bump actions/upload-artifact from 5 to 6 (#199) #629

Job	Run time
ruby-versions / Generate Ruby versions	5s
ubuntu-24.04 3.4	23s
ubuntu-24.04 3.3	26s
ubuntu-24.04 debug	37s
ubuntu-24.04 3.0	21s
ubuntu-24.04 2.7	50s
ubuntu-24.04 head	26s
ubuntu-24.04 3.2	29s
ubuntu-24.04 3.1	28s
ubuntu-22.04 3.0	28s
ubuntu-22.04 head	27s
ubuntu-22.04 3.1	21s
ubuntu-24.04 truffleruby-head	48s
ubuntu-22.04 3.2	30s
ubuntu-22.04 3.3	29s
ubuntu-22.04 jruby-head	1m 29s
ubuntu-24.04 jruby-head	1m 26s
ubuntu-22.04 truffleruby-head	41s
ubuntu-22.04 3.4	24s
ubuntu-22.04 debug	36s
ubuntu-22.04 2.7	50s
	12m 34s

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