ci: use codecov token

[cakebaker]

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[codecov]

Codecov Report

Attention: 211 lines in your changes are missing coverage. Please review.

Comparison is base (83e1431) 64.97% compared to head (261b28d) 66.80%.
Report is 58 commits behind head on main.

Files	Patch %	Lines
src/lib.rs	49.77%	87 Missing and 23 partials ⚠️
src/parse_relative_time.rs	76.32%	5 Missing and 84 partials ⚠️
src/parse_timestamp.rs	74.46%	11 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   64.97%   66.80%   +1.82%     
==========================================
  Files           3        5       +2     
  Lines         454      735     +281     
  Branches       93      182      +89     
==========================================
+ Hits          295      491     +196     
- Misses        111      135      +24     
- Partials       48      109      +61     

Flag	Coverage Δ
macos_latest	65.71% <68.39%> (+0.73%)	⬆️
ubuntu_latest	64.76% <67.38%> (-0.22%)	⬇️
windows_latest	6.99% <7.03%> (-60.98%)	⬇️

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