CI: fix examples - patch download MNIST

[Borda]

What does this PR do?

Resolves #6323 with pytorch/vision#1938 (comment)

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[pep8speaks]

Hello @Borda! Thanks for updating this PR.

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2021-03-05 16:26:22 UTC

[codecov]

Codecov Report

Merging #6357 (a4cdf68) into master (46540ee) will increase coverage by 2%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #6357    +/-   ##
=======================================
+ Coverage      91%     93%    +2%     
=======================================
  Files         161     161            
  Lines       11457   11457            
=======================================
+ Hits        10481   10692   +211     
+ Misses        976     765   -211     

[tchaton]

LGTM !