Remove unnecessary GitHub Graph info (#1910)

* Remove unnecessary GitHub Graph info

This code is no longer needed now that the GitHub dependency graph shipped support for `pyproject.toml`: https://github.com/orgs/community/discussions/6456#discussioncomment-5244057

setup.py

@@ -2,8 +2,6 @@
 
 import sys
 
-from setuptools import setup
-
 sys.stderr.write(
     """\
 ===============================
@@ -14,10 +12,3 @@
 """
 )
 sys.exit(1)
-
-# The code below will never execute, however is required to
-# display the "Used by" section on the GitHub repository.
-#
-# See: https://github.com/github/feedback/discussions/6456
-
-setup(name="django-debug-toolbar")