Update dependency django-phonenumber-field to <5.2

This MR contains the following updates:

Package	Type	Update	Change
django-phonenumber-field	dependencies	minor	<5.1 -> <5.2

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Release Notes

stefanfoulis/django-phonenumber-field

v5.1.0

Compare Source

• Allow sorting PhoneNumber\ s from Python
• Add support for Python 3.9 and Django 3.2
• Add Argentinian, Bulgarian, Indonesian, Ukrainian translations
• Update Esperanto and European Spanish translations

Backwards incompatible changes

• Drop support for Python 3.5

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