build(mypy): remove disallow_untyped_defs because it's already done by ruff rules

Author: bearomorphism

pyproject.toml

@@ -210,18 +210,13 @@ convention = "google"
 
 [tool.mypy]
 files = ["commitizen", "tests"]
-disallow_untyped_defs = true
 disallow_untyped_decorators = true
 disallow_subclassing_any = true
 warn_return_any = true
 warn_redundant_casts = true
 warn_unused_ignores = true
 warn_unused_configs = true
 
-[[tool.mypy.overrides]]
-module = "tests/*"
-disallow_untyped_defs = false
-
 [[tool.mypy.overrides]]
 module = "py.*"               # Legacy pytest dependencies
 ignore_missing_imports = true