py(deps) Add pydantic for typed, intuitive validation

See also:
- https://github.com/pydantic/pydantic
- https://docs.pydantic.dev/
- https://pypi.org/project/pydantic/

Author: tony

pyproject.toml

@@ -55,7 +55,8 @@ homepage = "https://vcspull.git-pull.com"
 dependencies = [
   "libvcs~=0.35.0",
   "colorama>=0.3.9",
-  "PyYAML>=6.0"
+  "PyYAML>=6.0",
+  "pydantic>=2.10.6",
 ]
 
 [project-urls]