♻️ Make Config.global ractor safe #2897

Job	Run time
ruby-versions / Generate Ruby versions	13s
build (3.2 / ubuntu-latest)	46s
build (3.2 / macos-latest)	23s
build (3.4 / macos-latest)	29s
build (3.2 / windows-latest)	2m 23s
build (3.3 / ubuntu-latest)	46s
build (3.3 / windows-latest)	1m 37s
build (3.4 / ubuntu-latest)	49s
build (4.0 / windows-latest)	1m 28s
build (truffleruby-head / ubuntu-latest)	1m 46s
build (4.0 / ubuntu-latest)	44s
build (head / windows-latest)	1m 28s
build (3.4 / windows-latest)	1m 22s
build (head / ubuntu-latest)	40s
build (head / macos-latest)	35s
build (4.0 / macos-latest)	38s
build (3.3 / macos-latest)	29s
	16m 36s

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