Mock dependency in mqtt tests

[Schamper]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 74.72%. Comparing base (5deff14) to head (9cfdf62).

❗ Current head 9cfdf62 differs from pull request most recent head 8f736aa. Consider uploading reports for the commit 8f736aa to get more accurate results

Files	Patch %	Lines
dissect/target/loaders/mqtt.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #574      +/-   ##
==========================================
- Coverage   74.73%   74.72%   -0.01%     
==========================================
  Files         288      288              
  Lines       23915    23891      -24     
==========================================
- Hits        17873    17853      -20     
+ Misses       6042     6038       -4     

Flag	Coverage Δ
unittests	74.72% <66.66%> (-0.01%)	⬇️

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