Bump llama-index from 0.11.7 to 0.12.1

Bumps [llama-index](https://github.com/run-llama/llama_index) from 0.11.7 to 0.12.1.
- [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@v0.11.7...v0.12.1)

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

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

setup.py

@@ -58,7 +58,7 @@
         "facehuggershield==0.1.11",
 
         # Llama index
-        "llama-index==0.11.7",
+        "llama-index==0.12.1",
         "llama-index-readers-file==0.2.0",
         "llama-index-readers-web==0.2.1",
         "llama-index-llms-huggingface==0.3.1",