chore(deps-dev): bump llama-index in the llama group across 1 directory

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


Updates `llama-index` from 0.12.17 to 0.12.19
- [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@v0.12.17...v0.12.19)

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

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