add codecov upload to windows.yml

[nicolocin]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Summary

Upload coverage report to codecov for windows test in Azure Pipelines

Checklist

• All tests passing
• I have added tests to cover my changes
• I have updated documentation (if necessary)
• My code follows the code style of this project
  (we are using black: you can pip install pre-commit,
  run pre-commit install in the pydra directory
  and black will be run automatically with each commit)

Acknowledgment

• I acknowledge that this contribution will be available under the Apache 2 license.

[codecov]

Codecov Report

Merging #263 into master will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #263      +/-   ##
==========================================
+ Coverage   86.44%   86.62%   +0.17%     
==========================================
  Files          19       19              
  Lines        3047     3072      +25     
  Branches      815      822       +7     
==========================================
+ Hits         2634     2661      +27     
+ Misses        258      256       -2     
  Partials      155      155              

Flag	Coverage Δ
#unittests	86.62% <ø> (+0.17%)	⬆️

Impacted Files	Coverage Δ
pydra/engine/core.py	89.55% <0.00%> (+0.55%)	⬆️
pydra/engine/task.py	79.68% <0.00%> (+0.78%)	⬆️

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