Bump django-mailman3 from 1.3.11 to 1.3.12 in /web

[dependabot[bot]]

Bumps django-mailman3 from 1.3.11 to 1.3.12.

Release notes

Sourced from django-mailman3's releases.

v1.3.12

Django-mailman3 1.3.12 release

Commits

• a18a669 Merge branch 'drop-django-41' into 'master'
• c3a48cd Set the version constraint correctly.
• fc51cd4 Merge branch 'prepare-1-3-12' into 'master'
• 75bff17 Drop dependency on Django <4.2 since they are EOL.
• f38fe5c Merge branch 'django50' into 'master'
• d4e7fb3 Set Django compatibility to 5.0
• 18113ec Translated using Weblate (Albanian)
• db16390 Translated using Weblate (Arabic)
• 1326e94 Merge branch 'weblate-gnu-mailman-django-mailman3' into 'master'
• 56988b8 Translated using Weblate (Ukrainian)
• Additional commits viewable in compare view

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[maxking]

@dependabot rebase