ci(codecov): fix errors with automated coverage

[d33bs]

Description

This PR addresses an issue we were having with Codecov running code coverage reports from GitHub Actions. Errors were silently failed due to how they were configured. The errors which appear to have been regarding rate limiting were fixed by updating the version of the Codecov Action which is used to the latest major revision. Successful runs can be exhibited within this PR (see the commenter below).

Moving forward I've "unsilenced" this step within CI to better observe errors in the future.

Closes #431

What is the nature of your change?

• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

Checklist

Please ensure that all boxes are checked before indicating that a pull request is ready for review.

• I have read the CONTRIBUTING.md guidelines.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• New and existing unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have deleted all non-relevant text in this pull request template.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.72%. Comparing base (c782728) to head (7149c08).
Report is 29 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #432      +/-   ##
==========================================
- Coverage   94.72%   94.72%   -0.01%     
==========================================
  Files          56       57       +1     
  Lines        3147     3145       -2     
==========================================
- Hits         2981     2979       -2     
  Misses        166      166              

Flag	Coverage Δ
unittests	94.72% <ø> (-0.01%)	⬇️

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[gwaybio]

Merge at will! Thanks for tracking this down...

[d33bs]

Thanks @gwaybio ! Merging this in now.