Bump engine.io and browser-sync

Bumps [engine.io](https://github.com/socketio/engine.io) to 6.2.1 and updates ancestor dependency [browser-sync](https://github.com/BrowserSync/browser-sync). These dependencies need to be updated together.


Updates `engine.io` from 3.5.0 to 6.2.1
- [Release notes](https://github.com/socketio/engine.io/releases)
- [Changelog](https://github.com/socketio/engine.io/blob/main/CHANGELOG.md)
- [Commits](https://github.com/socketio/engine.io/compare/3.5.0...6.2.1)

Updates `browser-sync` from 2.26.14 to 2.27.10
- [Release notes](https://github.com/BrowserSync/browser-sync/releases)
- [Changelog](https://github.com/BrowserSync/browser-sync/blob/master/CHANGELOG.md)
- [Commits](https://github.com/BrowserSync/browser-sync/compare/v2.26.14...v2.27.10)

---
updated-dependencies:
- dependency-name: engine.io
  dependency-type: indirect
- dependency-name: browser-sync
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -39,7 +39,7 @@
         "jquery.easing": "^1.4.1"
     },
     "devDependencies": {
-        "browser-sync": "2.26.14",
+        "browser-sync": "2.27.10",
         "del": "6.0.0",
         "gulp": "4.0.2",
         "gulp-autoprefixer": "7.0.1",