pyproject(tool.mypy[python_version]) Add 3.9

See also: https://mypy.readthedocs.io/en/stable/config_file.html#confval-python_version

Author: tony

pyproject.toml

@@ -147,7 +147,7 @@ exclude_lines = [
 ]
 
 [tool.ruff]
-target-version = "py38"
+target-version = "py39"
 
 [tool.ruff.lint]
 select = [