tests: Setup node is no longer required

Author: jcs090218

.github/workflows/build.yml

@@ -37,10 +37,6 @@ jobs:
         with:
           version: ${{ matrix.emacs-version }}
 
-      - uses: actions/setup-node@v2
-        with:
-          node-version: '16'
-
       - uses: emacs-eask/setup-eask@master
         with:
           version: 'snapshot'