ci: remove redundant step in tests

Author: nodkz

.github/workflows/nodejs.yml

@@ -36,10 +36,6 @@ jobs:
         with:
           check_name: JUnit Annotations for Node ${{ matrix.node-version }}
           report_paths: '**/coverage/junit/**/*.xml'
-      - name: Testing with previous graphql versions
-        run: yarn test-prev-vers
-        env:
-          CI: true      
       - name: Send codecov.io stats
         if: matrix.node-version == '12'
         run: bash <(curl -s https://codecov.io/bash) || echo ''