Reenable JRuby

See ruby#1228

Author: headius

.github/workflows/test.yml

@@ -11,7 +11,6 @@ jobs:
     with:
       # 2.7 breaks `test_parse_statements_nodoc_identifier_alias_method`
       min_version: 3.0
-      engine: cruby-truffleruby
 
   test:
     needs: ruby-versions