chore: BEG-7: Django 5 upgrade

[jombooth]

Couldn't resist giving this a shot because not having db_default is too frustrating 😂

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[robot-ci-heartex]

Follow Merge downstream workflow has been failed.

Workflow run

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 76.77%. Comparing base (44a690f) to head (0f9d371).
Report is 12 commits behind head on develop.

Files with missing lines	Patch %	Lines
label_studio/core/settings/base.py	20.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6614      +/-   ##
===========================================
- Coverage    76.77%   76.77%   -0.01%     
===========================================
  Files          170      170              
  Lines        13949    13949              
===========================================
- Hits         10710    10709       -1     
- Misses        3239     3240       +1     

Flag	Coverage Δ
pytests	76.77% <60.00%> (-0.01%)	⬇️

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[robot-ci-heartex]

Follow Merge downstream workflow has been failed.

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[niklub]

/git merge

Workflow run
Successfully merged: 12 files changed, 266 insertions(+), 21 deletions(-)