chore(deps): update dependency karma to v6

Author: renovate[bot]

apps/lit/package.json

@@ -38,7 +38,7 @@
     "deepmerge": "^4.2.2",
     "es-dev-server": "^1.23.1",
     "eslint": "^8.0.0",
-    "karma": "^4.4.1",
+    "karma": "^6.0.0",
     "karma-chai": "^0.1.0",
     "karma-mocha": "^1.3.0",
     "lit-analyzer": "^1.1.9",