Fix value conversion for `CONFIG GET`. #5272

Job	Run time
get-containers	0s
get-matrices	3s
lint-rust	3m 52s
Modules Tests	0s
test-java-container	0s
test-java (17, valkey, 8.0, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-gnu, ...	11m 42s
test-java (17, redis, 6.2, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-gnu, p...	8m 8s
	23m 45s

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