Bump jsondiffpatch and ai

Removes [jsondiffpatch](https://github.com/benjamine/jsondiffpatch). It's no longer used after updating ancestor dependency [ai](https://github.com/vercel/ai). These dependencies need to be updated together.


Removes `jsondiffpatch`

Updates `ai` from 4.2.0 to 5.0.81
- [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@4.2.0...ai@5.0.81)

---
updated-dependencies:
- dependency-name: jsondiffpatch
  dependency-version: 
  dependency-type: indirect
- dependency-name: ai
  dependency-version: 5.0.81
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package-lock.json

@@ -32,7 +32,7 @@
   },
   "dependencies": {
     "@usegrant/sdk": "^2.0.0",
-    "ai": "^4.2.0",
+    "ai": "^5.0.81",
     "zod": "^3.24.2"
   },
   "devDependencies": {