Remove zuul as devDependency (unmaintained/deprecated for 4 years and creating many npm audit vulns)

Author: slevithan

.github/workflows/build.yml

@@ -15,8 +15,3 @@ jobs:
         node-version: '15'
     - run: npm install
     - run: npm test
-    - shell: bash
-      env:
-        SAUCE_USERNAME: ${{ secrets.SAUCE_USERNAME }}
-        SAUCE_ACCESS_KEY: ${{ secrets.SAUCE_ACCESS_KEY }}
-      run: '[ -z "$SAUCE_USERNAME" ] || [ -z "$SAUCE_ACCESS_KEY" ] || npm run test-saucelabs'