remove usages of deprecated codecov package

[zacharyburnett]

Description

the codecov package is now deprecated and has been yanked from PyPI

[github-actions]

Thank you for your contribution! 🌌 This checklist is meant to remind the package maintainers who will review this pull request of some common things to look for.

• Do the proposed changes actually accomplish desired goals?
• Do the proposed changes follow the STScI coding guidelines?
• Are tests added/updated as required? If so, do they follow the STScI testing guidelines?
• Are docs added/updated as required?
• Is rebase and/or squash necessary? If so, please provide the author with appropriate instructions.
• Did the CI pass? If no, are the failures related?
• Is a change log needed?
• Is a milestone set? Milestone must be set but we cannot check for it on Actions; do not let the green checkmark fool you.

[github-actions]

👋 Thank you for your draft pull request! Do you know that you can use [ci skip] or [skip ci] in your commit messages to skip running continuous integration tests until you are ready?

[pllim]

Thanks!

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e956c6e) 97.09% compared to head (c3b38d7) 97.09%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #354   +/-   ##
=======================================
  Coverage   97.09%   97.09%           
=======================================
  Files          17       17           
  Lines        2032     2032           
=======================================
  Hits         1973     1973           
  Misses         59       59           

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