Migrate to newer version of Django

[UEWBot]

3.2 extended support ends April 2024 4.2.7 is an LTS release with mainstream support until December 2023 and extended support until April 2026 The beta for 5.0 is now available (see https://www.djangoproject.com/download/)

[UEWBot]

Looking at the release notes for 4.2 (https://docs.djangoproject.com/en/4.2/releases/4.2/), this one probably matters:

Setting update_fields in Model.save() may now be required¶ In order to avoid updating unnecessary columns, QuerySet.update_or_create() now passes update_fields to the Model.save() calls. As a consequence, any fields modified in the custom save() methods should be added to the update_fields keyword argument before calling super(). See Overriding predefined model methods for more details.

[UEWBot]

We have several custom save() methods. The following are unaffected by this change:

• Tournament
• Round
• Game

The following are affected:

• Player (_wdd_firstname, _wdd_lastname, and _old_wdd_id are all changed)
• Series (slug is changed)
• TournamentPlayer (backstabber_username, location, unranked are all changed)
• DrawProposal (passed is changed)

[UEWBot]

The codebase should now be ready for Django 4.2