chore(deps): update dependency chai to v6

Author: renovate[bot]

packages/core/package.json

@@ -50,7 +50,7 @@
     "test": "npx rstest --globals"
   },
   "dependencies": {
-    "chai": "^5.3.3",
+    "chai": "^6.0.1",
     "@types/chai": "^5.2.2",
     "@rsbuild/core": "1.5.0",
     "birpc": "2.5.0",