feat: update project description

Author: axl1313

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "codex-sdk"
 version = "0.1.0-alpha.9"
-description = "The official Python library for the Codex API"
+description = "Internal SDK used within cleanlab-codex package. Refer to https://pypi.org/project/cleanlab-codex/ instead."
 dynamic = ["readme"]
 license = "MIT"
 authors = [