ci: temporarily disable browser tests

The tests are in failure since the 13th November, without any logs from
Saucelabs, so we temporarily disable them until further investigation.

See: https://github.com/socketio/engine.io-client/actions/runs/3453198221

Author: darrachequesne

.github/workflows/ci.yml

@@ -24,22 +24,3 @@ jobs:
       - run: npm test
         env:
           CI: true
-
-  test-browser:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v2
-      - name: Use Node.js
-        uses: actions/setup-node@v1
-        with:
-          node-version: '10.x'
-      - run: npm ci
-      - run: npm test
-        env:
-          CI: true
-          BROWSERS: 1
-          NGROK_AUTH_TOKEN: ${{ secrets.NGROK_AUTH_TOKEN }}
-          SAUCE_USERNAME: ${{ secrets.SAUCE_USERNAME }}
-          SAUCE_ACCESS_KEY: ${{ secrets.SAUCE_ACCESS_KEY }}
-        timeout-minutes: 20