[GR-18163] setlocale() cleanup after fix in Prism and fix warnings #4594

Job	Run time
lint	13m 6s
ruby/spec on CRuby 3.0	3m 25s
build jvm	6m 30s
ruby/spec on CRuby 3.1	3m 23s
build native	13m 0s
ruby/spec on CRuby 3.2	2m 56s
test integration	11m 19s
fast specs	2m 22s
specs :truffle	9m 18s
specs :language :core	12m 27s
specs :library :cext :security :command_line :tracepoint	9m 55s
test native	3m 31s
run MRI tests on native	14m 55s
	1h 46m 7s

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