chore(deps): update dependency chai to v6

Author: renovate-bot

package.json

@@ -88,7 +88,7 @@
     "@types/sinon": "^17.0.4",
     "@types/through2": "^2.0.41",
     "c8": "^10.1.3",
-    "chai": "^4.5.0",
+    "chai": "^6.0.0",
     "chai-as-promised": "^7.1.2",
     "codecov": "^3.8.3",
     "duplexify": "^4.1.3",

samples/package.json

@@ -14,7 +14,7 @@
     "@google-cloud/firestore": "^8.3.0"
   },
   "devDependencies": {
-    "chai": "^4.2.0",
+    "chai": "^6.0.0",
     "mocha": "^7.0.0"
   }
 }