pyproject.toml: include subpackages in setuptools config

The glob patterns (include/exclude) must match the entire package name
to take effect, so we need to add a wildcard pattern for subpackages.

Otherwise, any wheels built won't include subpackages (like
pathspec.patterns) and things will break >.<

pyproject.toml

@@ -39,4 +39,4 @@ requires-python = ">=3.7"
 version = {attr = "pathspec._meta.__version__"}
 
 [tool.setuptools.packages.find]
-include = ["pathspec"]
+include = ["pathspec", "pathspec.*"]