Drop direct pydantic-core pin

Author: codex

requirements.txt

@@ -13,7 +13,6 @@ packaging==26.2
 pluggy==1.6.0
 Pygments==2.20.0
 pydantic==2.13.4
-pydantic_core==2.46.4
 pytest==9.1.1
 pytest-asyncio==1.4.0
 python-dotenv==1.2.2