Bump llama-index from 0.10.43 to 0.11.20

Bumps [llama-index](https://github.com/run-llama/llama_index) from 0.10.43 to 0.11.20.
- [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@v0.10.43...v0.11.20)

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

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

requirements/base.txt

@@ -56,7 +56,7 @@ poppler-utils
 # ------------------------------------------------------------------------------
 PyPDF2==3.0.1  # https://github.com/mstamy2/PyPDF2
 pandas
-llama-index==0.10.43
+llama-index==0.11.20
 llama-index-agent-openai==0.2.7
 llama-index-embeddings-huggingface==0.2.1
 llama-index-llms-openai==0.1.22