Run tests on multiple python versions

[alvalentini]

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[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.11 ⚠️

Comparison is base (34e59e9) 85.93% compared to head (894a47b) 85.82%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #433      +/-   ##
==========================================
- Coverage   85.93%   85.82%   -0.11%     
==========================================
  Files         189      189              
  Lines       24544    24343     -201     
==========================================
- Hits        21091    20892     -199     
+ Misses       3453     3451       -2     

Impacted Files	Coverage Δ
...ed_planning/grpc/generated/unified_planning_pb2.py	7.51% <100.00%> (-56.20%)	⬇️
unified_planning/test/test_protobuf_io.py	99.66% <100.00%> (ø)

... and 8 files with indirect coverage changes

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