ci.yml in rails-pg-extras-5.4.0

- old
+ new

@@ -55,11 +55,10 @@
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
       - name: Setup dependencies
         run: |
-          gem update --system
-          gem install bundler
+          gem install bundler -v 2.4.22
           sudo apt-get update --allow-releaseinfo-change
           sudo apt install postgresql-client
           sudo apt install libpq-dev
           bundle config set --local path 'vendor/bundle'
           bundle install