chore: try codecov token again

[nfischer]

I tried this recently in 1a1a820 and then reverted in b8b1c42. Unfortunately I'm still seeing spurious failures from codecov, so let's try the token one more time.

This time I double checked the token is provided by https://app.codecov.io/gh/shelljs/shelljs/settings. I regenerated the token for good measure.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a6d1e49) 97.27% compared to head (45ffea1) 97.27%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1151   +/-   ##
=======================================
  Coverage   97.27%   97.27%           
=======================================
  Files          36       36           
  Lines        1360     1360           
=======================================
  Hits         1323     1323           
  Misses         37       37           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[nfischer]

I verified that #1150 is being diffed against the right comment for coverage purposes (the PR says "codecov/project — 97.27% (+0.00%) compared to ec3e12b"). The real test will be to land 1 more change and see if the diff base stays up-to-date.