bump to min 3.9

Author: ocefpaf

pyproject.toml

@@ -55,7 +55,7 @@ write_to_template = "__version__ = '{version}'"
 tag_regex = "^(?P<prefix>v)?(?P<version>[^\\+]+)(?P<suffix>.*)?$"
 
 [tool.ruff]
-target-version = "py38"
+target-version = "py39"
 line-length = 79
 
 lint.select = [