Update dependency llama-index to ^0.13.0

Author: renovate[bot]

pyproject.toml

@@ -59,7 +59,7 @@ langchain = "^0.3.11"
 langchain-experimental = "^0.3.4"
 langchain-openai = "^0.3.2"
 litellm = "1.74.14"
-llama-index = "^0.12.6"
+llama-index = "^0.13.0"
 llama-index-agent-openai = "^0.4.1"
 llama-index-llms-openai = "^0.4.0"
 lxml = "^5.0.0"