Suppress errors when deleting temp dir

[Joonalai]

This PR resolves #41 by suppressing PermissionError when trying to delete temporary QGIS configuration directory.

[codecov-commenter]

Codecov Report

Patch coverage: 66.66% and project coverage change: +1.15 🎉

Comparison is base (d81a06d) 54.66% compared to head (4a4cfec) 55.81%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   54.66%   55.81%   +1.15%     
==========================================
  Files           7        7              
  Lines         472      464       -8     
==========================================
+ Hits          258      259       +1     
+ Misses        214      205       -9     

Flag	Coverage Δ
pytest	55.81% <66.66%> (+1.15%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pytest_qgis/pytest_qgis.py	53.62% <66.66%> (+0.95%)	⬆️

... and 3 files with indirect coverage changes

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[LKajan]

Apparently the copyright text jumped a bit by accident.

I'm a bit unsure if suppressing this warning is the right solution. Since no big harm is made by this I'm ok to merge this if a new issue is created for finding a proper solution (revisit the order of closing and deleting things) and link to that issue commented as todo.

[Joonalai]

Thanks for the feedback. I fixed the copyright comment and added a new issue addressing this problem #43.