fix: update llama-index requirement

Updates the requirements on [llama-index](https://github.com/run-llama/llama_index) to permit the latest version.
- [Release notes](https://github.com/run-llama/llama_index/releases)
- [Changelog](https://github.com/run-llama/llama_index/blob/main/CHANGELOG.md)
- [Commits](run-llama/llama_index@v0.6.0...v0.10.51)

---
updated-dependencies:
- dependency-name: llama-index
  dependency-type: direct:production
...

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

pyproject.toml

@@ -26,7 +26,7 @@ dependencies = [
   'azure-functions; python_version <= "3.10"',
   'azure-identity',
   'azure-keyvault-secrets',
-  'llama-index>=0.6.0,<0.9.0',
+  'llama-index>=0.10.51,<0.11.0',
   'httpx',
   'GitPython',
   'knack',