ci: dont reinstall npm for release

Author: felixfbecker

.github/workflows/build.yml

@@ -60,8 +60,6 @@ jobs:
         uses: actions/setup-node@v1
         with:
           node-version: '14.15.3'
-      - name: Install npm
-        run: npm install -g npm@^6.3.0
       - name: Install npm dependencies
         run: npm ci
       - name: Build VS Code extension