Changed "retry" dependency to "tenacity"

[Nusnus]

Fixed #305

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 25.21%. Comparing base (edbe791) to head (65cf3dc).
Report is 80 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pytest_celery/api/container.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #342      +/-   ##
==========================================
- Coverage   25.27%   25.21%   -0.07%     
==========================================
  Files          37       37              
  Lines        1187     1190       +3     
  Branches      235      235              
==========================================
  Hits          300      300              
- Misses        859      862       +3     
  Partials       28       28              

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