Add build as a requirement for Python 3.9 support.

TkTech · TkTech · commit 4037c30c1fcd · 2025-02-07T18:13:00.000-05:00
diff --git a/pyproject.toml b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=74.1"]
+requires = ["setuptools>=74.1", "build"]
 build-backend = "setuptools.build_meta"
 
 [project]
