fix: pin openai package version (#167)

Author: AzulGarza

docs/changelogs/index.md

@@ -3,6 +3,7 @@
 Welcome to the TimeCopilot Changelog. Here, you will find a comprehensive list of all the changes, updates, and improvements made to the TimeCopilot project. This section is designed to keep you informed about the latest features, bug fixes, and enhancements as we continue to develop and refine the TimeCopilot experience. Stay tuned for regular updates and feel free to explore the details of each release below.
 
 
+- [v0.0.16](v0.0.16.md)
 - [v0.0.15](v0.0.15.md)
 - [v0.0.14](v0.0.14.md)
 - [v0.0.13](v0.0.13.md)

docs/changelogs/v0.0.16.md

@@ -0,0 +1,7 @@
+### Fixes
+
+* **OpenAI Package Version Pinned**: Recent releases of the OpenAI package have been causing a `TypeError: Cannot instantiate typing.Union`. For more information, see [this issue](https://github.com/pydantic/pydantic-ai/issues/2476). Details can be found in [#xx](https://github.com/AzulGarza/timecopilot/pull/xx).
+
+---
+
+**Full Changelog**: https://github.com/AzulGarza/timecopilot/compare/v0.0.15...v0.0.16

pyproject.toml

@@ -44,6 +44,7 @@ dependencies = [
   "fire",
   "gluonts[torch]",
   "nixtla>=0.6.6",
+  "openai<=1.99.1",
   "pandas>=2.2.0 ; python_full_version >= '3.13'",
   "prophet>=1.1.7",
   "pydantic-ai[logfire]",