chore(deps): bump llama-index in the llama-index group

Bumps the llama-index group with 1 update: [llama-index](https://github.com/run-llama/llama_index).


Updates `llama-index` from 0.12.2 to 0.12.5
- [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@v0.12.2...v0.12.5)

---
updated-dependencies:
- dependency-name: llama-index
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: llama-index
...

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Author: dependabot[bot]