feat: replace python-memcached with pymemcache

[lrrb]

python-memcached is deprecated in django 4.x

#2877

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.42%. Comparing base (3020e45) to head (524f2bc).
Report is 29 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2878      +/-   ##
==========================================
+ Coverage   76.26%   76.42%   +0.15%     
==========================================
  Files          88       88              
  Lines        9688     9688              
  Branches     1971     1802     -169     
==========================================
+ Hits         7389     7404      +15     
+ Misses       2031     2024       -7     
+ Partials      268      260       -8     

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[deniszh]

Looks great, thanks!