Change setup.py to use setuptools

Author: damccorm

sdks/python/apache_beam/examples/complete/juliaset/setup.py

@@ -31,10 +31,7 @@
 
 import setuptools
 
-# It is recommended to import setuptools prior to importing distutils to avoid
-# using legacy behavior from distutils.
-# https://setuptools.readthedocs.io/en/latest/history.html#v48-0-0
-from distutils.command.build import build as _build  # isort:skip
+from setuptools.command.build import build as _build  # isort:skip
 
 
 # This class handles the pip install mechanism.