support python 3.9

[Borda]

What does this PR do?

includes:

• testing / CI for 3.9

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[Borda]

missing wheels for pytorch - pytorch/pytorch#45731

[codecov]

Codecov Report

Merging #4944 (30614d9) into master (0ea8f39) will decrease coverage by 4%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #4944    +/-   ##
=======================================
- Coverage      91%     87%    -4%     
=======================================
  Files         192     192            
  Lines       12266   12299    +33     
=======================================
- Hits        11178   10675   -503     
- Misses       1088    1624   +536     

[tchaton]

@Borda Should we close this PR ?

[Borda]

@Borda Should we close this PR ?

Let's keep it as a draft bc it is ready, just need PT to release wheels...

[ydcjeff]

we might need to wait a bit as torchvision and torchtext doesn't have 3.9 build in nightly.

[Borda]

blocked by microsoft/onnxruntime#6125

[Borda]

@tgaddair I have updated PR with master and seems like last failing test are Horovod, mind have look?

FAILED tests/models/test_horovod.py::test_horovod_cpu - assert 1 == 0
FAILED tests/models/test_horovod.py::test_horovod_cpu_implicit - assert 1 == 0

[kaushikb11]

🍾