Update dependency karma to v4.3.0

Author: renovate-bot

package-lock.json

@@ -24,7 +24,7 @@
     "fetch-mock": "6.5.2",
     "http-server": "0.11.1",
     "istanbul-instrumenter-loader": "3.0.1",
-    "karma": "4.2.0",
+    "karma": "4.3.0",
     "karma-chrome-launcher": "3.1.0",
     "karma-cli": "2.0.0",
     "karma-coverage": "2.0.1",