ci: set persist-credentials to false for checkout action

[codecov-commenter]

Codecov Report

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

Project coverage is 77.55%. Comparing base (ffb8bf6) to head (6bf3659).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #102 +/- ## ======================================= Coverage 77.55% 77.55% ======================================= Files 65 65 Lines 3596 3596 Branches 835 830 -5 ======================================= Hits 2789 2789 Misses 748 748 Partials 59 59 ```

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