Alias #string to #to_s/#to_str #374

Job	Run time
ruby-versions / Generate Ruby versions	3s
ubuntu-24.04 2.7	37s
ubuntu-24.04 3.0	14s
ubuntu-24.04 3.1	15s
ubuntu-24.04 3.2	13s
ubuntu-24.04 3.3	11s
ubuntu-24.04 debug	23s
ubuntu-24.04 head	16s
ubuntu-24.04 jruby-head	55s
ubuntu-24.04 truffleruby-head	27s
ubuntu-22.04 2.7	40s
ubuntu-22.04 3.0	14s
ubuntu-22.04 3.1	11s
ubuntu-22.04 3.2	9s
ubuntu-22.04 3.3	15s
ubuntu-22.04 debug	21s
ubuntu-22.04 head	16s
ubuntu-22.04 jruby-head	55s
ubuntu-22.04 truffleruby-head	27s
ubuntu-20.04 2.7	37s
ubuntu-20.04 3.0	16s
ubuntu-20.04 3.1	12s
ubuntu-20.04 3.2	13s
ubuntu-20.04 3.3	14s
ubuntu-20.04 debug	26s
ubuntu-20.04 head	10s
ubuntu-20.04 jruby-head	59s
ubuntu-20.04 truffleruby-head	25s
	10m 34s

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