Change 30k_methods to work with ractors

Author: etiennebarrie

benchmarks.yml

@@ -119,6 +119,7 @@ protoboeuf-encode:
   desc: 30k_methods tests thousands of nested method calls that mostly just call out to other single-call methods.
   category: micro
   single_file: true
+  ractor: true
 cfunc_itself:
   desc: cfunc_itself just calls the 'itself' method many, many times.
   category: micro