Add missing type hints

Author: tuokri

UDKTests/run_udk_tests.py

@@ -90,8 +90,8 @@ def __init__(
         self._fh: IO | None = None
         self._pos = 0
         self._state = State.NONE
-        self._warnings = []
-        self._errors = []
+        self._warnings: list[str] = []
+        self._errors: list[str] = []
 
     @property
     def warnings(self) -> list[str]: