ci: don't install latest npm (#168)

* ci: only use supported version of npm

* don't install npm

Author: fasttime

.github/workflows/ci.yml

@@ -35,8 +35,6 @@ jobs:
     - uses: actions/setup-node@v3
       with:
         node-version: ${{ matrix.node }}
-    - name: Install latest NPM
-      run: npm install -g npm@latest
     - name: Install dependencies
       run: npm ci
     - name: Run tests