Bump django from 6.0.3 to 6.0.4 in /generator (#8416)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

generator/setup.py

@@ -37,7 +37,7 @@
          'googleapis.codegen.script_stubs:RunExpandTemplates')
       ]},
     include_package_data=True,
-    install_requires=['django==6.0.3',
+    install_requires=['django==6.0.4',
                       #'google-apputils',
                       'httplib2',
                       'absl-py',