Change version to 2.7

Author: Nia

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
 
     - name: Get Ruby version
       id: rubyversion
-      run: echo "::set-output name=version::3.0"
+      run: echo "::set-output name=version::2.7"
 
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1