Drop support for Python 3.6 and add support for Python 3.10

[saraedum]

Dependencies:

• [x] https://github.com/conda-forge/cppyy-feedstock/pull/54
• [x] Python 3.10 migration needs to run for sagelib in conda-forge, see https://conda-forge.org/status/#python310
  • [x] i.e., https://github.com/conda-forge/pplpy-feedstock/pull/10

[codecov[bot]]

Codecov Report

Merging #221 (7c7d04d) into master (a203f3f) will decrease coverage by 0.05%. The diff coverage is n/a.

:exclamation: Current head 7c7d04d differs from pull request most recent head e5c42a6. Consider uploading reports for the commit e5c42a6 to get more accurate results

@@            Coverage Diff             @@
##           master     #221      +/-   ##
==========================================
- 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]

This is now part of #225.