Update Ruby version in release workflow to 3.3

Author: reeshika-h

.github/workflows/release-gem.yml

@@ -14,10 +14,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - name: Set up Ruby 2.7
+    - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '2.7'
+        ruby-version: '3.3'
 
     - name: Publish to RubyGems
       run: |