Admin: Fix mypy

[bblommers]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.60%. Comparing base (1e4364d) to head (b481483).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
moto/core/models.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8435   +/-   ##
=======================================
  Coverage   94.60%   94.60%           
=======================================
  Files        1167     1167           
  Lines      101685   101685           
=======================================
  Hits        96198    96198           
  Misses       5487     5487           

Flag	Coverage Δ
servertests	28.83% <0.00%> (ø)
unittests	94.57% <0.00%> (ø)

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