fix #482: callback memory repo

[Kiruha01]

Fixed

#482 Race condition in callback memory repo

PR checklist

• I've written good commit message for all commits
• I've split changes into separate commits where it's appropriate
• I've added the description of function to documentation
• I've updated project version in pyproject.toml
• I'll make a release when PR is merged
• I'll bump pybotx in bot-template

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (09a8cec) to head (3ce0a68).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #484   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          120       120           
  Lines         4165      4175   +10     
  Branches       363       365    +2     
=========================================
+ Hits          4165      4175   +10     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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