Updated ruby version to 3.3 for integration tests

Author: leszekamz

.github/workflows/ruby-rubypg-integ-tests.yml

@@ -34,10 +34,10 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v4
 
-    - name: Set up Ruby 2.5
+    - name: Set up Ruby 3.3
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '2.5'
+        ruby-version: '3.3'
         bundler-cache: true
 
     - name: Configure AWS Credentials