Update mongo Docker tag to v8

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This PR contains the following updates:

Package	Update	Change
mongo	major	4.0 -> 8.0

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.25%. Comparing base (c5e2d9a) to head (28b2799).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
- Coverage   85.71%   81.25%   -4.47%     
==========================================
  Files           5        5              
  Lines         112      112              
==========================================
- Hits           96       91       -5     
- Misses         16       21       +5     

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