build: Update codecov and use token

[arbrandes]

Update codecov to the latest version and start using the org-wide token for uploads.

See openedx/wg-frontend#179

[coveralls]

Pull Request Test Coverage Report for Build 9507868350

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 55.473%

---

Totals
Change from base Build 9176434855:	0.0%
Covered Lines:	168
Relevant Lines:	305

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💛 - Coveralls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.22%. Comparing base (14b2a51) to head (c369727).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #186   +/-   ##
=======================================
  Coverage   58.22%   58.22%           
=======================================
  Files          25       25           
  Lines         395      395           
  Branches       66       66           
=======================================
  Hits          230      230           
  Misses        149      149           
  Partials       16       16           

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