Django-digid-eherkenning

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Nothing functional. Changed the verbose names of

* eHerkenning service *instance* UUID
* eIDAS service *instance* UUID

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* Made EHerkenningConfiguration.loa required
It was previously possible to accidentally misconfigure by selecting the
empty option for the LOA in the admin.

This patch contains a migration that will set undefined eHerkennning LOAs to
low_plus. But if you have an invalid LOA set, the migration will fail with
an IntegrityError. In case this happens, go to the admin and select a LOA.

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Feature release

* Added configurable Content-Type header for DigiD SAML
* Implemented a way to override the global configuration defaults for Level Of Assurance (LOA)
* [30] Ensure generated metadata has xml tag
* [35] Confirmed support for Django 4.2

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Quality of life updates

* [27] Removed Python 3.7 and 3.8 from test matrix (3.7 is EOL, 3.8 is not used in our
envs anymore)
* [25] Removed Django Choices usage in tests
* The post-binding form is now hidden from the end-user

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Small housekeeping release

* Dropped django-choices dependency
* Updated codecov github action to v3
* Confirmed support for Django 4.0 and 4.1
* Format with latest version of black

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Bugfix release

* Fixed missing migration due to changed help texts/labels in the models
* Added some robustness in metadata generation when the IDP configuration doesn't match
the IDP metadata to prevent crashes