[ruby/prism] Recompile when config.yml changes #749

Job	Run time
ruby-bench (--warmup=1 --bench=1 --excludes=lobsters,shipit)	14m 8s
make (check, cppflags=-DVM_CHECK_MODE)	9m 13s
make (test-bundler-parallel, 50)	22m 21s
make (check, --disable-yjit)	7m 30s
make (check, i686)	11m 5s
make (test-bundled-gems)	20m 46s
make (check, --enable-shared --enable-load-relative)	8m 32s
make-ibm	0s
make (check, ubuntu-24.04, capi)	10m 37s
Ubuntu result	3s
	1h 44m 15s

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