ci: fix codecov report upload

[Belco90]

Checks

• I have read the contributing guidelines.

Changes

• Forward corresponding secret to reusable workflow, so codecov can read the token for uploading the coverage report.

Example of successful run.

Context

Fixes #1098

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.28%. Comparing base (9b81dde) to head (ac07ebb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1127   +/-   ##
=======================================
  Coverage   96.28%   96.28%           
=======================================
  Files          52       52           
  Lines        5894     5894           
  Branches     1481     1481           
=======================================
  Hits         5675     5675           
  Misses        213      213           
  Partials        6        6           

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