Add support for DRF 3.15, drop Django <4.2 and DRF <3.14

[browniebroke]

Builds on top of #183

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.23%. Comparing base (6b24fae) to head (fc2a87f). Report is 15 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #186   +/-   ##
=======================================
  Coverage   98.23%   98.23%           
=======================================
  Files           3        3           
  Lines         227      227           
=======================================
  Hits          223      223           
  Misses          4        4           

Flag	Coverage Δ
unittests	98.23% <ø> (ø)

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[ir4y]

@ruscoder Could you please have a final look on this pull request and merge?

[ruscoder]

Hi @browniebroke, thanks for the contribution, merged. I'll publish a new release as 0.7.1

[browniebroke]

Thanks!

Since I opened this, Python 3.8 reached EOL, Python 3.13 was released as well as Django 5.1, so I've just opened a couple of follow up PRs to update CI and package metadata:

• https://github.com/beda-software/drf-writable-nested/pull/187
• https://github.com/beda-software/drf-writable-nested/pull/188

Should be pretty similar to this one.