fix: remove setting of CODECOV_TOKEN in env file

[thomasrockhu-codecov]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (1673fc3) to head (21deed5).
Report is 49 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #247   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            4         4           
=========================================
  Hits             4         4           

Flag	Coverage Δ
ENV_VAR_CONTAINING_FLAG	?
string_flag	?

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[spalmurray]

What was the problem and how does this fix it?