Remove unneeded step

Author: st0012

.github/workflows/test.yml

@@ -36,9 +36,6 @@ jobs:
       with:
         ruby-version: ${{ matrix.ruby }}
         bundler-cache: true # 'bundle install' and cache
-    # Avoid issues on these platforms
-    - if: ${{ matrix.ruby == '2.6' }}
-      run: gem update --system
     - name: Run test
       run: bundle exec rake
       env: