fix: pin version of pydantic for compatibility (#16)

* fix pydantic version to <2.12

---------

Co-authored-by: Kashish Hora <kashishhora@gmail.com>

Author: naji247

pyproject.toml

@@ -20,7 +20,7 @@ classifiers = [
 dependencies = [
     "mcp>=1.2.0",
     "mcpcat-api==0.1.4",
-    "pydantic>=2.0.0",
+    "pydantic>=2.0.0,<2.12",
     "requests>=2.31.0",
 ]