change cast to annotation

Author: herobank110

src/pytestqt/__init__.py

@@ -1,6 +1,4 @@
-from typing import cast
-
 # _version is automatically generated by setuptools_scm
-from pytestqt._version import version  # type: ignore[import-not-found]
+from pytestqt._version import version
 
-__version__ = cast("str", version)
+__version__: str = version