Update traits-stubs setup.py file for release (#1709)

This PR updates the traits stubs setup.py file in preparation for releasing stubs to go alongside the Traits 6.4.0 release.

We also remove the redundant __init__.py file from the examples directory - the Python files in this directory aren't intended to be used via import.

traits-stubs/setup.py

@@ -12,15 +12,15 @@
 
 
 def get_long_description():
-    """ Read long description from README.rst. """
+    """Read long description from README.rst."""
     with open("README.rst", "r", encoding="utf-8") as readme:
         return readme.read()
 
 
 if __name__ == "__main__":
     setuptools.setup(
         name="traits-stubs",
-        version="6.1.0",
+        version="6.4.0",
         url="https://github.com/enthought/traits",
         author="Enthought",
         author_email="info@enthought.com",
@@ -39,6 +39,9 @@ def get_long_description():
             Programming Language :: Python :: 3.6
             Programming Language :: Python :: 3.7
             Programming Language :: Python :: 3.8
+            Programming Language :: Python :: 3.9
+            Programming Language :: Python :: 3.10
+            Programming Language :: Python :: 3.11
             Programming Language :: Python :: Implementation :: CPython
             Topic :: Scientific/Engineering
             Topic :: Software Development
@@ -62,9 +65,11 @@ def get_long_description():
         packages=[
             "traits-stubs",
             "traits_stubs_tests",
-            "traits_stubs_tests.examples",
         ],
-        package_data={"traits-stubs": ["./*.pyi", "./**/*.pyi"]},
+        package_data={
+            "traits-stubs": ["*.pyi"],
+            "traits_stubs_tests": ["examples/*.py", "numpy_examples/*.py"],
+        },
         license="BSD",
         python_requires=">=3.6",
     )