Bump engine.io from 6.4.1 to 6.4.2 in /demo/angular

Bumps [engine.io](https://github.com/socketio/engine.io) from 6.4.1 to 6.4.2.
- [Release notes](https://github.com/socketio/engine.io/releases)
- [Changelog](https://github.com/socketio/engine.io/blob/main/CHANGELOG.md)
- [Commits](socketio/engine.io@6.4.1...6.4.2)

---
updated-dependencies:
- dependency-name: engine.io
  dependency-type: indirect
...

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

Author: dependabot[bot]

demo/angular/yarn.lock

@@ -2812,9 +2812,9 @@ engine.io-parser@~5.0.3:
   integrity sha512-tjuoZDMAdEhVnSFleYPCtdL2GXwVTGtNjoeJd9IhIG3C1xs9uwxqRNEu5WpnDZCaozwVlK/nuQhpodhXSIMaxw==
 
 engine.io@~6.4.1:
-  version "6.4.1"
-  resolved "https://registry.yarnpkg.com/engine.io/-/engine.io-6.4.1.tgz#8056b4526a88e779f9c280d820422d4e3eeaaae5"
-  integrity sha512-JFYQurD/nbsA5BSPmbaOSLa3tSVj8L6o4srSwXXY3NqE+gGUNmmPTbhn8tjzcCtSqhFgIeqef81ngny8JM25hw==
+  version "6.4.2"
+  resolved "https://registry.yarnpkg.com/engine.io/-/engine.io-6.4.2.tgz#ffeaf68f69b1364b0286badddf15ff633476473f"
+  integrity sha512-FKn/3oMiJjrOEOeUub2WCox6JhxBXq/Zn3fZOMCBxKnNYtsdKjxhl7yR3fZhM9PV+rdE75SU5SYMc+2PGzo+Tg==
   dependencies:
     "@types/cookie" "^0.4.1"
     "@types/cors" "^2.8.12"