Fix: exclude admin perms from group permissions serializer

[shamoon]

Proposed change

Same as the fix we used for users

paperless-ngx/src/paperless/serialisers.py

Line 30 in fda4742

queryset=Permission.objects.exclude(content_type__app_label="admin"),

Closes #6607

Type of change

• Bug fix: non-breaking change which fixes an issue.
• New feature / Enhancement: non-breaking change which adds functionality. Please read the important note above.
• Breaking change: fix or feature that would cause existing functionality to not work as expected.
• Documentation only.
• Other. Please explain:

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have included testing coverage for new code in this PR, for backend and / or front-end changes.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.18%. Comparing base (fda4742) to head (9deb999).

❗ Current head 9deb999 differs from pull request most recent head c90bbf1. Consider uploading reports for the commit c90bbf1 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #6608   +/-   ##
=======================================
  Coverage   97.18%   97.18%           
=======================================
  Files         436      436           
  Lines       17933    17933           
  Branches     1514     1505    -9     
=======================================
  Hits        17429    17429           
- Misses        501      504    +3     
+ Partials        3        0    -3     

Flag	Coverage Δ
backend	95.87% <ø> (ø)
frontend	98.63% <ø> (ø)

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