[TEST] Enable CI on multiple versions of pytorch

[cthoyt]

Blocked by #12

[codecov-commenter]

Codecov Report

Merging #14 (ea01a38) into main (47a7ad0) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #14   +/-   ##
=======================================
  Coverage   85.90%   85.90%           
=======================================
  Files           4        4           
  Lines         149      149           
  Branches       28       28           
=======================================
  Hits          128      128           
  Misses         11       11           
  Partials       10       10           

Impacted Files	Coverage Δ
src/torch_ppr/utils.py	87.61% <100.00%> (ø)

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