chore(deps): update dependency karma to v6

Author: renovate-bot

package.json

@@ -36,7 +36,7 @@
     "codelyzer": "^6.0.0",
     "jasmine-core": "~3.6.0",
     "jasmine-spec-reporter": "~5.0.0",
-    "karma": "5.2.3",
+    "karma": "6.3.20",
     "karma-chrome-launcher": "~3.1.0",
     "karma-coverage-istanbul-reporter": "~3.0.2",
     "karma-jasmine": "~4.0.0",