Update Ruff target-version to 3.9 (#241)

noxfile.py

@@ -1,6 +1,5 @@
 from pathlib import Path
 from tempfile import NamedTemporaryFile
-from typing import List
 
 import nox
 from nox import parametrize
@@ -42,7 +41,7 @@ def fmt(s: Session) -> None:
         ["ruff", "format", "--check", "."],
     ],
 )
-def lint(s: Session, command: List[str]) -> None:
+def lint(s: Session, command: list[str]) -> None:
     s.run(*command)
 
 

pyproject.toml

@@ -81,7 +81,8 @@ enable_error_code = ["explicit-override"]
 
 [tool.ruff]
 line-length = 99
-target-version = "py38"
+# TODO: Remove this when migrating to [project] requires-python field.
+target-version = "py39"
 src = ["src"]
 # Ruff will automatically exclude all files listed in .gitignore as well as common temporary Python
 # tool directories.