Update django-phonenumber-field requirement from ==8.3.* to ==8.4.* (#5771)

Updates the requirements on [django-phonenumber-field](https://github.com/stefanfoulis/django-phonenumber-field) to permit the latest version.
- [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](https://github.com/stefanfoulis/django-phonenumber-field/compare/8.3.0...8.4.0)

---
updated-dependencies:
- dependency-name: django-phonenumber-field
  dependency-version: 8.4.0
  dependency-type: direct:production
...

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pyproject.toml

@@ -51,7 +51,7 @@ dependencies = [
   "django-markup",
   "django-oauth-toolkit==2.3.*",
   "django-otp==1.7.*",
-  "django-phonenumber-field==8.3.*",
+  "django-phonenumber-field==8.4.*",
   "django-redis==6.0.*",
   "django-scopes==2.0.*",
   "django-statici18n==2.6.*",