build(deps): Bump django-anymail from 12.0 to 13.0 (#1488)

Bumps [django-anymail](https://github.com/anymail/django-anymail) from 12.0 to 13.0.
- [Release notes](https://github.com/anymail/django-anymail/releases)
- [Changelog](https://github.com/anymail/django-anymail/blob/main/CHANGELOG.rst)
- [Commits](anymail/django-anymail@v12.0...v13.0)

---
updated-dependencies:
- dependency-name: django-anymail
  dependency-version: '13.0'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

poetry.lock

@@ -56,7 +56,7 @@ boto3 = "^1.38.6"
 django = "^5.1"
 django-active-link = "^0.2.2"
 django-allauth = {extras = ["socialaccount"], version = "^65.7.0"}
-django-anymail = "^12.0"
+django-anymail = "^13.0"
 django-appconf = "^1.1.0"
 django-bootstrap3 = "^25.1"
 django-cleanup = "^9.0.0"