CI: Enable "ObjectSpace" in JRuby

    ObjectSpace is disabled; each_object will only work with Class, pass -X+O to enable

Also: Quote 3.0 to avoid YAML Float-to-String conversion loss

Author: olleolleolle

.github/workflows/development.yml

@@ -17,7 +17,7 @@ jobs:
           - 2.5
           - 2.6
           - 2.7
-          - 3.0
+          - "3.0"
 
         experimental: [false]
         env: [""]
@@ -30,6 +30,7 @@ jobs:
           - os: ubuntu
             ruby: jruby
             experimental: true
+            env: "JRUBY_OPTS=-X+O"
           - os: ubuntu
             ruby: head
             experimental: true