[GR-18163] setlocale() cleanup after fix in Prism and fix warnings #4593

Job	Run time
build native	6m 35s
lint	13m 25s
ruby/spec on CRuby 3.0	3m 23s
build jvm	6m 48s
ruby/spec on CRuby 3.1	3m 27s
ruby/spec on CRuby 3.2	2m 56s
test native	0s
run MRI tests on native	0s
fast specs	2m 19s
test integration	11m 40s
specs :truffle	9m 4s
specs :language :core	12m 28s
specs :library :cext :security :command_line :tracepoint	9m 57s
	1h 22m 2s

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