update codecov to v2

[briantist]

Update codecov action to v2

See also:

• CI - update codecov action to v2 ansible-collections/community.hashi_vault#108
• https://github.com/codecov/codecov-action#%EF%B8%8F--deprecration-of-v1
• feat: Use new Codecov uploader codecov/codecov-action#392
• https://docs.codecov.com/docs/about-the-codecov-bash-uploader
• https://docs.codecov.com/docs/codecov-uploader

[codecov]

Codecov Report

Merging #21 (3ca7203) into master (6ed80fc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #21   +/-   ##
=======================================
  Coverage   43.82%   43.82%           
=======================================
  Files          17       17           
  Lines        1255     1255           
  Branches      192      192           
=======================================
  Hits          550      550           
  Misses        694      694           
  Partials       11       11           

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[zturechek]

lgtm! ty