chore: update dependency chai to v6

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -31,7 +31,7 @@
     "@commitlint/config-conventional": "^19.8.1",
     "@eslint/eslintrc": "^3.3.1",
     "@types/express": "^5.0.3",
-    "chai": "^5.3.3",
+    "chai": "^6.0.1",
     "eslint": "^9.34.0",
     "eslint-config-loopback": "^13.1.0",
     "eslint-plugin-mocha": "^10.5.0",