chore(deps): update dependency karma to v6.4.4

Author: renovate[bot]

package.json

@@ -20,7 +20,7 @@
     "browserify": "16.5.2",
     "browserify-shim": "3.8.16",
     "jasmine-core": "3.99.1",
-    "karma": "6.3.16",
+    "karma": "6.4.4",
     "karma-browserify": "7.0.0",
     "karma-chrome-launcher": "3.1.1",
     "karma-jasmine": "3.3.1",