chore: bump engine.io-parser to version 5.0.3

In order to make sure the types added in [1] are included.

Related:

- #639
- #640

[1]: socketio/engine.io-parser@ad5bd7d

package.json

@@ -39,7 +39,7 @@
     "cookie": "~0.4.1",
     "cors": "~2.8.5",
     "debug": "~4.3.1",
-    "engine.io-parser": "~5.0.0",
+    "engine.io-parser": "~5.0.3",
     "ws": "~8.2.3"
   },
   "devDependencies": {