Python: s/tox/nox/g

[landrito]

Updates #1320

[codecov-io]

Codecov Report

Merging #1512 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1512      +/-   ##
============================================
+ Coverage     86.92%   86.94%   +0.02%     
- Complexity     4112     4119       +7     
============================================
  Files           404      404              
  Lines         16575    16609      +34     
  Branches       1762     1764       +2     
============================================
+ Hits          14407    14441      +34     
  Misses         1683     1683              
  Partials        485      485

Impacted Files	Coverage Δ	Complexity Δ
...ansformer/py/PythonPackageMetadataTransformer.java	97.8% <100%> (+0.31%)	40 <6> (+4)	⬆️
...transformer/py/PythonImportSectionTransformer.java	97% <100%> (+0.17%)	54 <3> (+3)	⬆️

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[lukesneeringer]

LGTM provided that the tests pass on a local attempt.

[landrito]

Tests passed!