chore(deps): update dependency karma to v6 (#155)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

package.json

@@ -71,7 +71,7 @@
     "eslint-plugin-react": "^7.22.0",
     "expect.js": "^0.3.1",
     "jquery": "^3.5.1",
-    "karma": "^5.2.3",
+    "karma": "^6.1.1",
     "karma-chrome-launcher": "^3.1.0",
     "karma-firefox-launcher": "^2.1.0",
     "karma-html2js-preprocessor": "^1.1.0",