fix: pydantic 2.4 is bugged

Fix Optional field with validate_default only performing one field validation
by @sydney-runkle in pydantic/pydantic-core#1002

.github/workflows/test.yml

@@ -37,7 +37,7 @@ jobs:
     strategy:
       matrix:
         py_version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
-        pydantic_ver: ["<2", ">=2,<3"]
+        pydantic_ver: ["<2", ">=2.5,<3"]
         os: [ubuntu-latest, windows-latest]
     runs-on: "${{ matrix.os }}"
     steps: