pyproject.toml: Set target-version to py39 to match comment.

schwehr · JamesParrott · commit 61505d121d2f · 2025-07-21T14:43:40.000+01:00
diff --git a/pyproject.toml b/pyproject.toml
@@ -2,7 +2,6 @@
 requires = ["setuptools"]
 build-backend = "setuptools.build_meta"
 
-
 [tool.ruff]
 # Exclude a variety of commonly ignored directories.
 exclude = [
