Bump engine.io and karma

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


Updates `engine.io` from 3.2.0 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/3.2.0...6.2.1)

Updates `karma` from 3.0.0 to 6.4.1
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/karma/compare/v3.0.0...v6.4.1)

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

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

package.json

@@ -37,7 +37,7 @@
     "zone.js": "~0.8.26"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "^15.0.4",
+    "@angular-devkit/build-angular": "^0.13.10",
     "@angular/cli": "~6.2.5",
     "@angular/compiler-cli": "^6.1.0",
     "@angular/language-service": "^6.1.0",
@@ -47,7 +47,7 @@
     "codelyzer": "~4.3.0",
     "jasmine-core": "~2.99.1",
     "jasmine-spec-reporter": "~4.2.1",
-    "karma": "~3.0.0",
+    "karma": "~6.4.1",
     "karma-chrome-launcher": "~2.2.0",
     "karma-coverage-istanbul-reporter": "~2.0.1",
     "karma-jasmine": "~1.1.2",