Bump karma from 5.0.0 to 6.3.14

Bumps [karma](https://github.com/karma-runner/karma) from 5.0.0 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](https://github.com/karma-runner/karma/compare/v5.0.0...v6.3.14)

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

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

package.json

@@ -39,7 +39,7 @@
   },
   "devDependencies": {
     "gh-pages": "^3.0.0",
-    "karma": "^5.0.0",
+    "karma": "^6.3.14",
     "karma-chrome-launcher": "^3.0.0",
     "karma-cljs-test": "^0.1.0",
     "karma-firefox-launcher": "^1.2.0",