chore(deps): update dependency chai to v6

Author: renovate[bot]

package.json

@@ -36,7 +36,7 @@
     "parse-ms": "2.1.0"
   },
   "devDependencies": {
-    "chai": "4.3.3",
+    "chai": "6.0.0",
     "eslint": "5.16.0",
     "eslint-config-standard": "11.0.0",
     "eslint-plugin-import": "2.27.5",