build(deps): bump ai from 5.0.73 to 5.0.76 (#3745)

Bumps [ai](https://github.com/vercel/ai) from 5.0.73 to 5.0.76.
- [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@5.0.73...ai@5.0.76)

---
updated-dependencies:
- dependency-name: ai
  dependency-version: 5.0.76
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

packages/backend/package.json

@@ -113,7 +113,7 @@
     "@ai-sdk/openai-compatible": "^1.0.22",
     "@huggingface/gguf": "^0.3.2",
     "@huggingface/hub": "^2.6.12",
-    "ai": "^5.0.73",
+    "ai": "^5.0.76",
     "express": "^5.1.0",
     "express-openapi-validator": "^5.6.0",
     "isomorphic-git": "^1.34.0",