ci: remove legacy step

Author: UlisesGascon

.github/workflows/ci.yml

@@ -26,7 +26,5 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
-      - run: npm install -g npm@^8
-        if: matrix.node-version == '14.x'
       - run: npm ci
       - run: npm test