Bump django-anymail from 8.3 to 8.4 (#738)
Bump django-anymail from 8.3 to 8.4 (#738)

Bumps [django-anymail](https://github.com/anymail/django-anymail) from 8.3 to 8.4.
- [Release notes](https://github.com/anymail/django-anymail/releases)
- [Changelog](https://github.com/anymail/django-anymail/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/anymail/django-anymail/compare/v8.3...v8.4)

---
updated-dependencies:
- dependency-name: django-anymail
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
KlubJagiellonski/pola-backend,KlubJagiellonski/pola-backend,KlubJagiellonski/pola-backend,KlubJagiellonski/pola-backend