update ruby version for appcast action

Author: MattKiazyk

.github/workflows/appcast.yml

@@ -22,10 +22,10 @@ jobs:
         restore-keys: |
           ${{ runner.os }}-gems-
           
-    # - name: Setup Ruby, JRuby and TruffleRuby
-    #   uses: ruby/[email protected]
-    #   with:
-    #     ruby-version: '3.0'
+    - name: Setup Ruby, JRuby and TruffleRuby
+      uses: ruby/[email protected]
+      with:
+        ruby-version: '3.0'
 
     - name: Bundler 💎
       working-directory: AppCast