Fix packaging: missing source files (#381)

Author: corydolphin

pyproject.toml

@@ -46,7 +46,7 @@ requires = ["setuptools"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools]
-py-modules = ["flask_cors"]
+packages = ["flask_cors"]
 # This is a workaround for https://github.com/astral-sh/uv/issues/9513
 license-files = []