chore(deps): bump ai from 6.0.166 to 6.0.168 in the ai-sdk group

Bumps the ai-sdk group with 1 update: [ai](https://github.com/vercel/ai).


Updates `ai` from 6.0.166 to 6.0.168
- [Release notes](https://github.com/vercel/ai/releases)
- [Changelog](https://github.com/vercel/ai/blob/main/CHANGELOG.md)
- [Commits](https://github.com/vercel/ai/compare/ai@6.0.166...ai@6.0.168)

---
updated-dependencies:
- dependency-name: ai
  dependency-version: 6.0.168
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: ai-sdk
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

packages/backend/package.json

@@ -114,7 +114,7 @@
     "@ai-sdk/openai-compatible": "^2.0.41",
     "@huggingface/gguf": "^0.4.2",
     "@huggingface/hub": "^2.11.0",
-    "ai": "^6.0.166",
+    "ai": "^6.0.168",
     "express": "^5.2.1",
     "express-openapi-validator": "^5.6.2",
     "isomorphic-git": "^1.37.5",