Update gem-push.yml

Use ruby 3.2

.github/workflows/gem-push.yml

@@ -14,10 +14,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Ruby 2.7
+    - name: Set up Ruby 3.2
       uses: actions/setup-ruby@v1
       with:
-        ruby-version: 2.7.x
+        ruby-version: 3.2.x
 
 #     - name: Publish to GPR
 #       run: |