build(deps-dev): bump karma from 4.4.1 to 6.3.16

Bumps [karma](https://github.com/karma-runner/karma) from 4.4.1 to 6.3.16.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v4.4.1...v6.3.16)

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

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

Author: dependabot[bot]

packages/browser/package.json

@@ -27,7 +27,7 @@
     "chai": "^4.1.2",
     "chokidar": "^3.0.2",
     "jsdom": "^15.0.0",
-    "karma": "^4.1.0",
+    "karma": "^6.3.16",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^2.2.0",
     "karma-firefox-launcher": "^2.1.2",