drop py3.8, restrict pymongo upper version, tox cleanup

[brondsem]

• drop python 3.8 since its unsupported. (Can't add python 3.13 support yet since formencode and webob use cgi still)
• restrict pymongo upper version until we fix the issues it causes
• clean up tox output

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.13%. Comparing base (637a033) to head (1bd8fbd).
Report is 21 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
+ Coverage   90.19%   91.13%   +0.93%     
==========================================
  Files          43       43              
  Lines        6724     6711      -13     
==========================================
+ Hits         6065     6116      +51     
+ Misses        659      595      -64     

Flag	Coverage Δ
tests-3.10	91.32% <100.00%> (+0.93%)	⬆️
tests-3.11	91.32% <100.00%> (+0.93%)	⬆️
tests-3.12	91.32% <100.00%> (?)
tests-3.7	?
tests-3.8	?
tests-3.9	91.12% <100.00%> (+0.93%)	⬆️
tests-pypy3.9	91.26% <100.00%> (+0.93%)	⬆️

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[dill0wn]

looks good to me