build(deps-dev): bump karma from 6.3.8 to 6.3.14 in /demo

Bumps [karma](https://github.com/karma-runner/karma) from 6.3.8 to 6.3.14.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v6.3.8...v6.3.14)

---
updated-dependencies:
- dependency-name: karma
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

demo/package-lock.json

@@ -62,7 +62,7 @@
     "codelyzer": "^6.0.2",
     "jasmine-core": "~3.10.1",
     "jasmine-spec-reporter": "~7.0.0",
-    "karma": "~6.3.8",
+    "karma": "~6.3.14",
     "karma-chrome-launcher": "~3.1.0",
     "karma-coverage-istanbul-reporter": "^3.0.3",
     "karma-firefox-launcher": "^2.1.2",