Update dependency karma to v6 [SECURITY]

Author: renovate[bot]

angular-client/package.json

@@ -57,7 +57,7 @@
     "graphql-codegen-typescript-common": "^0.15.0",
     "jasmine-core": "~3.3.0",
     "jasmine-spec-reporter": "~4.2.1",
-    "karma": "~3.1.0",
+    "karma": "~6.3.16",
     "karma-chrome-launcher": "~2.2.0",
     "karma-coverage-istanbul-reporter": "~2.0.1",
     "karma-jasmine": "~2.0.0",