update codecov action from 1.5.2 to 2.0.2

[mkolopanis]

bump codecov action version

Description

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)
• [ ] Reference simulation update or replacement
• [ ] Documentation change (documentation changes only)
• [ ] Version change
• [x] Build or continuous integration change

Build or continuous integration change checklist:

• [ ] If required or optional dependencies have changed (including version numbers), I have updated the readme to reflect this.
• [ ] If this is a new CI setup, I have added the associated badge to the readme and to references/make_index.py (if appropriate).

[codecov[bot]]

Codecov Report

Merging #359 (807123a) into main (a9d357d) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #359   +/-   ##
=======================================
  Coverage   99.07%   99.07%           
=======================================
  Files          13       13           
  Lines        1941     1941           
=======================================
  Hits         1923     1923           
  Misses         18       18           

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