[ruby/prism] Remove `Prism.lex_ripper` #73

Job	Run time
ruby-bench (--zjit-call-threshold=2, --warmup=1 --bench=1 --excludes=lobsters, --enable-zjit=dev_...	22m 5s
make (zjit-check, --enable-yjit --enable-zjit=dev, 1.85.0)	5m 47s
make (check, --zjit-disable-hir-opt --zjit-call-threshold=1, -T --zjit-disable-hir-opt -T --zjit-...	16m 49s
cargo clippy	46s
make (zjit-bindgen, To fix: use patch in logs, --enable-zjit=dev --enable-yjit --with-gcc=clang-1...	5m 19s
make (check, --zjit-call-threshold=1, -T --zjit-call-threshold=1, --enable-zjit=dev)	21m 32s
make (test-bundled-gems, --enable-zjit=dev, --zjit-call-threshold=1)	20m 3s
make (btest, --zjit-call-threshold=2, --enable-zjit=dev)	5m 47s
ZJIT Ubuntu result	4s
	1h 38m 12s

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