Bump karma from 5.2.3 to 6.3.14 in /src/danfojs-browser

Bumps [karma](https://github.com/karma-runner/karma) from 5.2.3 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@v5.2.3...v6.3.14)

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

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

Author: dependabot[bot]

src/danfojs-browser/package.json

@@ -89,7 +89,7 @@
     "ify-loader": "^1.1.0",
     "install-peers": "^1.0.3",
     "json-loader": "^0.5.7",
-    "karma": "5.2.3",
+    "karma": "6.3.14",
     "karma-browserify": "7.0.0",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^3.1.0",