Update dependency chai to v6

Author: renovate[bot]

package-lock.json

@@ -30,7 +30,7 @@
   },
   "devDependencies": {
     "apidoc": "0.27.1",
-    "chai": "4.3.4",
+    "chai": "6.2.0",
     "cross-env": "7.0.3",
     "eslint": "7.25.0",
     "eslint-config-airbnb-base": "14.2.1",