Undo accidental chai dependency bump

Author: veeck

package-lock.json

@@ -24,7 +24,7 @@
     "vinyl": "^3.0.1"
   },
   "devDependencies": {
-    "chai": "^6.0.1",
+    "chai": "^4.5.0",
     "eslint": "^8.57.1",
     "eslint-config-gulp": "^5.0.1",
     "gulp": "^4.0.2",