Removed startup event.

[s3rius]

Removed startup event so we can use spawn multiprocessing model instead of fork. Because MacOS's security policies break forking.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (7030a54) 77.31% compared to head (9de5c10) 72.71%.
Report is 2 commits behind head on develop.

Files	Patch %	Lines
taskiq/cli/worker/run.py	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #266      +/-   ##
===========================================
- Coverage    77.31%   72.71%   -4.61%     
===========================================
  Files           60       60              
  Lines         1750     1748       -2     
===========================================
- Hits          1353     1271      -82     
- Misses         397      477      +80     

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