ci: test against python 3.11

[ap--]

run tests against 3.11 since Jpype supports it now.

[codecov-commenter]

Codecov Report

Merging #84 (b3c2799) into main (5848158) will increase coverage by 0.89%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
+ Coverage   89.16%   90.06%   +0.89%     
==========================================
  Files          27       27              
  Lines        3499     3836     +337     
==========================================
+ Hits         3120     3455     +335     
- Misses        379      381       +2     

Impacted Files	Coverage Δ
paquo/jpype_backend.py	85.60% <0.00%> (-2.28%)	:arrow_down:
paquo/images.py	98.95% <0.00%> (-0.03%)	:arrow_down:
paquo/tests/conftest.py	100.00% <0.00%> (ø)
paquo/tests/test_projects.py	100.00% <0.00%> (ø)
paquo/tests/test_readonly.py	100.00% <0.00%> (+0.58%)	:arrow_up:
paquo/projects.py	96.33% <0.00%> (+0.58%)	:arrow_up:
paquo/hierarchy.py	81.95% <0.00%> (+0.59%)	:arrow_up:

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