Update gempush.yml

Author: imagekitio

.github/workflows/gempush.yml

@@ -13,7 +13,7 @@ jobs:
     - name: Set up Ruby 2.6
       uses: ruby/[email protected]
       with:
-        version: 2.6.5
+        ruby-version: 2.6.5
 
     - name: Run Test Cases
       run: |