ci: test on python3.10

[onerandomusername]

add 3.10 testing to the workflows. Still need to see if all of our major dependencies have wheels for 3.10

[codecov[bot]]

Codecov Report

Merging #119 (0630b2d) into main (b63eb07) will increase coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #119      +/-   ##
==========================================
+ Coverage   70.72%   70.74%   +0.01%     
==========================================
  Files          33       33              
  Lines        1602     1603       +1     
  Branches      190      197       +7     
==========================================
+ Hits         1133     1134       +1     
  Misses        438      438              
  Partials       31       31              

Impacted Files	Coverage Δ
tests/modmail/test_logs.py	100.00% <0.00%> (ø)

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[Shivansh-007]

I am going to mark this as a draft until we confirm 3.10 wheels on our deps.

[onerandomusername]

Ahhhhh, I forgot to update this, I've confirmed we have wheels for all of our main dependencies on linux.