chore: update llama-index package version requirements

Update minimum version requirements for llama-index packages to match
the versions already installed as dependencies of litellm 1.80.0:
- llama-index-llms-openai: 0.6.5 -> 0.6.12
- llama-index-llms-openai-like: 0.3.3 -> 0.5.3

This ensures compatibility with the latest OpenAI models and prevents
accidental downgrades in future dependency resolutions.

Author: Mini256

backend/pyproject.toml

@@ -50,8 +50,8 @@ dependencies = [
     "python-pptx>=1.0.2",
     "openpyxl>=3.1.5",
     "llama-index>=0.12.16",
-    "llama-index-llms-openai>=0.6.5",
-    "llama-index-llms-openai-like>=0.3.3",
+    "llama-index-llms-openai>=0.6.12",
+    "llama-index-llms-openai-like>=0.5.3",
     "llama-index-llms-bedrock-converse>=0.4.15",
     "llama-index-llms-ollama>=0.5.0",
     "llama-index-llms-google-genai>=0.1.6",