[FIX] MultipleObjectsReturned in Character Mining Ledger

[Geuthur]

Description

Please include a summary of the changes and the related issue number (if applicable).

Type of Changes

Please select the type of changes made in this pull request:

• Bug Fix (non-breaking change which fixes an Issue)
• New Feature (non-breaking change)
• Other (please specify):

Checklist

Please ensure the following before submitting your pull request:

• I have read the contributing guidelines.
• My code follows the code style of this project.
• I have performed a self-review of my code.
• I have commented my code where necessary.
• All new and existing tests passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##           master     #305      +/-   ##
==========================================
- Coverage   65.65%   65.64%   -0.00%     
==========================================
  Files          52       52              
  Lines        4363     4362       -1     
  Branches      444      444              
==========================================
- Hits         2864     2863       -1     
  Misses       1372     1372              
  Partials      127      127              

Files with missing lines	Coverage Δ
ledger/managers/character_mining_manager.py	62.04% <100.00%> (-0.34%)	⬇️
ledger/models/characteraudit.py	85.91% <100.00%> (ø)
ledger/models/general.py	85.82% <100.00%> (ø)

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