Log Message:
py-django-mailman3: updated to 1.3.15

1.3.15 (2024-06-29)

Use the source-includes directive in pyproject.toml instead of
includes to include files that aren't required for wheels and
doesn't need to be copied to site-packages.

1.3.14 (2024-06-23)

This release has _also_ been yanked from PyPI because of bad build

Fix the pyproject.toml metadata for packaging.

1.3.13 (2024-06-22)

This release has been yanked from PyPI due to bad build.

Fix social account buttons to work with providers other than oauth with
multiple sub-providers.
Format date and time in Django DATETIME_FORMAT