Enable CI build for JRuby on Windows

Author: jcouball

.github/workflows/continuous-integration.yml

@@ -30,8 +30,8 @@ jobs:
             operating-system: windows-latest
           - ruby: 3.3
             operating-system: windows-latest
-          # - ruby: jruby-head
-          #   operating-system: windows-latest
+          - ruby: jruby-head
+            operating-system: windows-latest
 
     env:
       JAVA_OPTS: -Djdk.io.File.enableADS=true