Update karma to version 6.3.20

Author: depfu[bot]

front-end/package-lock.json

@@ -60,7 +60,7 @@
     "cordova-plugin-whitelist": "^1.3.5",
     "jasmine-core": "~3.8.0",
     "jasmine-spec-reporter": "~5.0.0",
-    "karma": "~6.3.19",
+    "karma": "~6.3.20",
     "karma-chrome-launcher": "~3.1.0",
     "karma-coverage-istanbul-reporter": "~3.0.2",
     "karma-jasmine": "~4.0.0",