Add precise values for enum members where possible (#11299)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Alex Waygood <alex.waygood@gmail.com>

stubs/setuptools/setuptools/command/editable_wheel.pyi

@@ -13,9 +13,9 @@ from ..warnings import SetuptoolsWarning
 _WheelFile: TypeAlias = Incomplete
 
 class _EditableMode(Enum):
-    STRICT: str
-    LENIENT: str
-    COMPAT: str
+    STRICT = "strict"
+    LENIENT = "lenient"
+    COMPAT = "compat"
     @classmethod
     def convert(cls, mode: str | None) -> _EditableMode: ...