ci: test python 3.10

[jyooru]

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Prerequisites

• Have you read the documentation on contributing? https://github.com/bee-san/pyWhat/wiki/Adding-your-own-Regex

Why do we need this pull request?

People are starting to use Python 3.10, so pyWhat should be tested on Python 3.10.

What GitHub issues does this fix?

None

Copy / paste of output

Please copy and paste the output of PyWhat with your new addition using an example that tests this addition below:

[codecov-commenter]

Codecov Report

Merging #221 (1b09380) into main (b04de11) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #221   +/-   ##
=======================================
  Coverage   92.52%   92.53%           
=======================================
  Files          14       14           
  Lines        1204     1205    +1     
=======================================
+ Hits         1114     1115    +1     
  Misses         90       90           

Impacted Files	Coverage Δ
pywhat/printer.py	77.85% <0.00%> (+0.15%)	⬆️

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