Drop Python 3.6 support

[saraedum]

and add Python 3.10 support.

We do not really need Python 3.7 we just don't run tests and build conda packages for 3.6 anymore. Also, we only require Python 3.6 so distributions that want to support Python 3.6 for longer do not need to patch our build scripts.

Fixes #215.

This needs the following dependencies:

• [ ] https://github.com/conda-forge/cppyy-feedstock/pull/54

[codecov[bot]]

Codecov Report

Merging #218 (03cae64) into master (a203f3f) will decrease coverage by 0.05%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #218      +/-   ##
==========================================
- Coverage   92.16%   92.11%   -0.06%     
==========================================
  Files         105      105              
  Lines        2055     2054       -1     
==========================================
- Hits         1894     1892       -2     
- Misses        161      162       +1     

Impacted Files	Coverage Δ
libeantic/e-antic/renf_class.hpp	50.00% <0.00%> (-50.00%)	:arrow_down:

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[saraedum]

Superseded by #221.