Pytest7 compatibility

[derfred]

Fixes #352.

Changes proposed.

[fizyk]

Also, this change requires pytest >= 6.2 make sure to update setup.cfg

[codecov-commenter]

Codecov Report

Merging #354 (8fdfeab) into main (00ec629) will increase coverage by 0.20%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main     #354      +/-   ##
==========================================
+ Coverage   61.38%   61.58%   +0.20%     
==========================================
  Files          14       14              
  Lines         303      302       -1     
==========================================
  Hits          186      186              
+ Misses        117      116       -1     

Flag	Coverage Δ
linux	61.58% <33.33%> (+0.20%)	⬆️
mariadb	59.93% <33.33%> (+0.19%)	⬆️
mysql	57.61% <33.33%> (+0.19%)	⬆️

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Impacted Files	Coverage Δ
src/pytest_mysql/factories/process.py	59.37% <33.33%> (+1.79%)	⬆️

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[fizyk]

@derfred thank you!