chore(deps): update dependency karma to v6

Author: renovate-bot

package.json

@@ -22,7 +22,7 @@
     "gulp-ng-annotate": "^1.1.0",
     "gulp-rename": "^1.2.2",
     "gulp-uglify": "^1.4.2",
-    "karma": "~0.12.0",
+    "karma": "6.3.17",
     "karma-chrome-launcher": "^0.1.12",
     "karma-coverage": "~0.3.1",
     "karma-coveralls": "^1.1.0",