[deps] Update phonenumbers requirement from ~=8.13.44 to ~=8.13.48

Updates the requirements on [phonenumbers](https://github.com/daviddrysdale/python-phonenumbers) to permit the latest version.
- [Commits](daviddrysdale/python-phonenumbers@v8.13.44...v8.13.48)

---
updated-dependencies:
- dependency-name: phonenumbers
  dependency-type: direct:production
...

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

requirements.txt

@@ -2,7 +2,7 @@ django-organizations~=2.4.1
 django-extensions~=3.2.3
 django-allauth[socialaccount]~=0.63.6
 django-phonenumber-field~=8.0.0
-phonenumbers~=8.13.44
+phonenumbers~=8.13.48
 openwisp-utils[rest,celery]~=1.1.0
 packaging
 django-sesame~=3.2.2