[Merged by Bors] - chore: Remove unused environment variable in CI step

[fasmat]

Motivation

codecov/codecov-action@v4 doesn't need the defined environment variable, it gains access to the token via the token argument passed to it.

Description

Just removed the unneeded environment variable.

Test Plan

Existing tests pass

TODO

• [x] Explain motivation or link existing issue(s)
• [x] Test changes and document test plan
• [x] Update documentation as needed
• [x] Update changelog as needed

[fasmat]

bors merge

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.7%. Comparing base (062d40c) to head (15e9f9b). Report is 1 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #6343 +/- ## ========================================= - Coverage 81.7% 81.7% -0.1% ========================================= Files 312 312 Lines 34637 34637 ========================================= - Hits 28327 28324 -3 - Misses 4479 4480 +1 - Partials 1831 1833 +2 ```

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[spacemesh-bors[bot]]

Pull request successfully merged into develop.

Build succeeded:

• ci-status
• systest-status