fix: Define a default_auto_field on the app config

[marksweb]

Description

This defines a default_auto_field on the app config so django won't try to create migrations for the app if someone moves their project to big auto field.

Related resources

• Please update migrations to reflect current models #1293

Checklist

• I have opened this pull request against master
• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• I have read the contribution guidelines and I have joined #workgroup-pr-review on
  Slack to find a “pr review buddy” who is going to review my pull request.

[codecov]

Codecov Report

Merging #1294 (3f4f706) into master (ee1a72e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1294   +/-   ##
=======================================
  Coverage   72.20%   72.21%           
=======================================
  Files          72       72           
  Lines        3238     3239    +1     
  Branches      563      563           
=======================================
+ Hits         2338     2339    +1     
  Misses        734      734           
  Partials      166      166           

Impacted Files	Coverage Δ
filer/apps.py	100.00% <100.00%> (ø)

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