Support python 3.11 and drop python 3.6 support

[wyfo]

No description provided.

[codecov-commenter]

Codecov Report

Merging #516 (bc70a8a) into master (dac721e) will decrease coverage by 0.06%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #516      +/-   ##
==========================================
- Coverage   87.86%   87.79%   -0.07%     
==========================================
  Files          62       62              
  Lines        5678     5680       +2     
  Branches     1188     1236      +48     
==========================================
- Hits         4989     4987       -2     
- Misses        477      480       +3     
- Partials      212      213       +1     

Impacted Files	Coverage Δ
apischema/conversions/visitor.py	95.23% <ø> (ø)
apischema/utils.py	86.97% <0.00%> (ø)
apischema/typing.py	85.58% <75.00%> (-0.26%)	⬇️
apischema/conversions/utils.py	72.72% <100.00%> (+0.63%)	⬆️
apischema/discriminators.py	95.12% <100.00%> (-0.12%)	⬇️
apischema/graphql/relay/global_identification.py	77.00% <100.00%> (+0.23%)	⬆️
apischema/json_schema/types.py	93.02% <100.00%> (+0.34%)	⬆️
apischema/visitor.py	88.78% <100.00%> (+0.21%)	⬆️
apischema/methods.py	81.81% <0.00%> (-4.55%)	⬇️

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[wyfo]

Close in favor of #515