[bug] Deprecation warnings from dj_rest_auth in logs

[Dhanus3133]

While running openwisp-radius, the logs show multiple deprecation warnings coming from dj_rest_auth serializers:

.../site-packages/dj_rest_auth/registration/serializers.py:228: UserWarning: app_settings.USERNAME_REQUIRED is deprecated, use: app_settings.SIGNUP_FIELDS['username']['required']
  required=allauth_account_settings.USERNAME_REQUIRED,
.../site-packages/dj_rest_auth/registration/serializers.py:230: UserWarning: app_settings.EMAIL_REQUIRED is deprecated, use: app_settings.SIGNUP_FIELDS['email']['required']
  email = serializers.EmailField(required=allauth_account_settings.EMAIL_REQUIRED)
.../site-packages/dj_rest_auth/registration/serializers.py:288: UserWarning: app_settings.EMAIL_REQUIRED is deprecated, use: app_settings.SIGNUP_FIELDS['email']['required']
  email = serializers.EmailField(required=allauth_account_settings.EMAIL_REQUIRED)
.../site-packages/dj_rest_auth/registration/serializers.py:228: UserWarning: app_settings.USERNAME_REQUIRED is deprecated, use: app_settings.SIGNUP_FIELDS['username']['required']
  required=allauth_account_settings.USERNAME_REQUIRED,
.../site-packages/dj_rest_auth/registration/serializers.py:230: UserWarning: app_settings.EMAIL_REQUIRED is deprecated, use: app_settings.SIGNUP_FIELDS['email']['required']
  email = serializers.EmailField(required=allauth_account_settings.EMAIL_REQUIRED)
.../site-packages/dj_rest_auth/registration/serializers.py:288: UserWarning: app_settings.EMAIL_REQUIRED is deprecated, use: app_settings.SIGNUP_FIELDS['email']['required']
  email = serializers.EmailField(required=allauth_account_settings.EMAIL_REQUIRED)
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[jevinjojo]

@Dhanus3133 @nemesifier Shall we also update dj-rest-auth to ≥7.1 as we drop the old config flags USERNAME_REQUIRED and EMAIL_REQUIRED. the current version is <7.1

[vishwasvk35]

@jevinjojo 7.0.1 is the latest release of dj_rest_auth so it can't be upgraded.