chore(dev-deps): update dependency karma to v6.4.2

Author: renovate[bot]

package-lock.json

@@ -77,7 +77,7 @@
     "google-closure-compiler": "20210302.0.0",
     "google-closure-compiler-js": "20200719.0.0",
     "jasmine-core": "4.6.0",
-    "karma": "6.3.17",
+    "karma": "6.4.2",
     "karma-chrome-launcher": "3.1.1",
     "karma-firefox-launcher": "2.1.2",
     "karma-jasmine": "4.0.2",