Update dependency django to v4 [SECURITY]

Author: renovate-bot

generator/setup.py

@@ -39,7 +39,7 @@
     include_package_data=True,
     # TODO(user): Any 1.8 version is OK, but django<1.9 seems to do the wrong
     #     thing. It installs version 1.9rc1, which is not compatible.
-    install_requires=['django==2.2.28',
+    install_requires=['django==4.2.16',
                       #'google-apputils',
                       'httplib2',
                       'absl-py',