Update ruby.yml

Author: gaorlov

.github/workflows/ruby.yml

@@ -55,7 +55,7 @@ jobs:
     # uses: ruby/setup-ruby@v1
       uses: ruby/setup-ruby@55283cc23133118229fd3f97f9336ee23a179fcf # v1.146.0
       with:
-        ruby-version: ${{ matrix.ruby-version }}
+        ruby-version: ${{ matrix.ruby }}
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
     - name: Run tests
       run: bundle exec rake