chore(deps): update dependency karma to v6 [security]

Author: renovate[bot]

package.json

@@ -133,7 +133,7 @@
     "imports-loader": "0.8.0",
     "istanbul-instrumenter-loader": "1.2.0",
     "json-loader": "0.5.7",
-    "karma": "1.7.1",
+    "karma": "6.3.16",
     "karma-chrome-launcher": "2.2.0",
     "karma-coverage": "1.1.2",
     "karma-jasmine": "1.1.2",