build(deps): bump ai from 4.3.19 to 5.0.42

Bumps [ai](https://github.com/vercel/ai) from 4.3.19 to 5.0.42.
- [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/[email protected]@5.0.42)

---
updated-dependencies:
- dependency-name: ai
  dependency-version: 5.0.42
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

packages/backend/package.json

@@ -113,7 +113,7 @@
     "@ai-sdk/openai-compatible": "^0.2.16",
     "@huggingface/gguf": "^0.2.1",
     "@huggingface/hub": "^2.6.3",
-    "ai": "^4.3.19",
+    "ai": "^5.0.44",
     "express": "^4.21.2",
     "express-openapi-validator": "^5.6.0",
     "isomorphic-git": "^1.33.1",