fix: remove tests directory from wheel (#121)

* fix: remove tests directory from wheel

Fixes #120

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

setup.py

@@ -36,7 +36,7 @@
     author_email="googleapis-packages@google.com",
     license="Apache 2.0",
     url="https://github.com/googleapis/python-org-policy",
-    packages=setuptools.PEP420PackageFinder.find(),
+    packages=setuptools.PEP420PackageFinder.find(exclude=["tests*"]),
     namespace_packages=("google", "google.cloud"),
     platforms="Posix; MacOS X; Windows",
     include_package_data=True,