/usr/share/python-djangocms-admin-style-common/templates/admin/inc/extrastyle.html is in python-djangocms-admin-style-common 1.2.2+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | {# override this template with your app to have extra styles #}
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