Remove constant `Random::DEFAULT` #4391

Job	Run time
build native	14m 8s
lint	13m 14s
build jvm	6m 25s
ruby/spec on CRuby 3.0	3m 21s
ruby/spec on CRuby 3.1	3m 18s
ruby/spec on CRuby 3.2	2m 47s
test integration	8m 55s
specs :truffle	8m 50s
specs :language :core	11m 33s
fast specs	1m 54s
specs :library :cext :security :command_line :tracepoint	8m 26s
run MRI tests on native	14m 7s
test native	2m 56s
	1h 39m 54s

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