stop using git access token

[codecov-commenter]

Codecov Report

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

Project coverage is 86.17%. Comparing base (17d9634) to head (7920e43).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #607 +/- ## ======================================= Coverage 86.17% 86.17% ======================================= Files 32 32 Lines 1360 1360 ======================================= Hits 1172 1172 Misses 188 188 ``` | [Flag](https://app.codecov.io/gh/scality/runner-manager/pull/607/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scality) | Coverage Δ | | |---|---|---| | [api](https://app.codecov.io/gh/scality/runner-manager/pull/607/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scality) | `64.33% <ø> (ø)` | | | [unit](https://app.codecov.io/gh/scality/runner-manager/pull/607/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scality) | `68.38% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scality#carryforward-flags-in-the-pull-request-comment) to find out more.

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