chore(deps): update dependency chai to v6

Author: renovate-bot

samples/package.json

@@ -40,7 +40,7 @@
     "@google-cloud/bigquery": "^8.0.0",
     "@google-cloud/typeless-sample-bot": "^3.0.0",
     "@types/chai": "^4.2.16",
-    "chai": "^4.2.0",
+    "chai": "^6.0.0",
     "gts": "^6.0.0",
     "lru-cache": "9.1.2",
     "mocha": "^9.2.2",