ci: try update codecov@v4 w/ token

[erisu]

Platforms affected

n/a

Motivation and Context

v3 no longer works without token and v4 also requires token.

Tested alternative code coverage tools, such as coveralls, and they also require a token. #271

Will attempt to update codecov instead.

Description

update codecov and set token property

Testing

n/a

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.62%. Comparing base (c7d3dc0) to head (500bb0a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #272   +/-   ##
=======================================
  Coverage   83.62%   83.62%           
=======================================
  Files          14       14           
  Lines         519      519           
=======================================
  Hits          434      434           
  Misses         85       85           

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[erisu]

Closing out as the changes are merged with PR #270