build(deps): bump phonenumbers from 8.13.11 to 8.13.15 (#51)

Bumps [phonenumbers](https://github.com/daviddrysdale/python-phonenumbers) from 8.13.11 to 8.13.15.
- [Commits](https://github.com/daviddrysdale/python-phonenumbers/compare/v8.13.11...v8.13.15)

---
updated-dependencies:
- dependency-name: phonenumbers
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -4,7 +4,7 @@ djangorestframework==3.14.0
 
 gunicorn==20.1.0
 
-phonenumbers==8.13.11
+phonenumbers==8.13.15
 psycopg2-binary==2.9.6
 
 pycountry==22.3.5