ci: add token to env for requests tests

[wpbonelli]

Should avoid rate limiting like here?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.345%. Comparing base (5dfbb50) to head (5786da2).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##           develop      #233       +/-   ##
=============================================
- Coverage   84.826%   84.345%   -0.481%     
=============================================
  Files           20        20               
  Lines         3506      3507        +1     
=============================================
- Hits          2974      2958       -16     
- Misses         532       549       +17     

see 5 files with indirect coverage changes

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