chore: bump django-phonenumber-field[phonenumbers] in /app

Bumps [django-phonenumber-field[phonenumbers]](https://github.com/stefanfoulis/django-phonenumber-field) from 8.0.0 to 8.4.0.
- [Release notes](https://github.com/stefanfoulis/django-phonenumber-field/releases)
- [Changelog](https://github.com/django-phonenumber-field/django-phonenumber-field/blob/main/CHANGELOG.rst)
- [Commits](django-phonenumber-field/django-phonenumber-field@8.0.0...8.4.0)

---
updated-dependencies:
- dependency-name: django-phonenumber-field[phonenumbers]
  dependency-version: 8.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

app/requirements.txt

@@ -24,7 +24,7 @@ django-extensions==3.2.3
     # via -r requirements.in
 django-linear-migrations==2.16.0
     # via -r requirements.in
-django-phonenumber-field[phonenumbers]==8.0.0
+django-phonenumber-field[phonenumbers]==8.4.0
     # via -r requirements.in
 django-timezone-field==7.0
     # via -r requirements.in