[setup] Fix, download_url (#8439)

* [setup] Fix, download_url

Author: dpgaspar

setup.py

@@ -121,9 +121,7 @@ def get_git_sha():
     author="Apache Software Foundation",
     author_email="[email protected]",
     url="https://superset.apache.org/",
-    download_url=(
-        "https://dist.apache.org/repos/dist/release/superset/" + version_string
-    ),
+    download_url="https://www.apache.org/dist/incubator/superset/" + version_string,
     classifiers=[
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",