Update dependency django-phonenumber-field to v6

v6.1.0

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• Make formfields.PhoneNumberField honor PHONENUMBER_DEFAULT_REGION
• Use PHONENUMBER_DEFAULT_REGION for example phone number in form field errors.
• Add support for Django 4.0
• Add Persian (farsi) translations.
• Update uk_AR translations

Backwards incompatible changes

• Drop support for Python 3.6

v6.0.0

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• Add support for Python 3.10
• Update Czech, Dutch and pt_BR translations

Backwards incompatible changes

• formfields.PhoneNumberField with a region now display national phone numbers in the national format instead of PHONENUMBER_DEFAULT_FORMAT. International numbers are displayed in the PHONENUMBER_DEFAULT_FORMAT.