Trying to fix 403 API error via adding `sleep`

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 4.00%. Comparing base (0163132) to head (ffa3f04). Report is 1 commits behind head on main.

Files	Patch %	Lines
src/Generator.php	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #190 +/- ## ========================================== - Coverage 4.10% 4.00% -0.11% Complexity 20 20 ========================================== Files 4 4 Lines 73 75 +2 ========================================== Hits 3 3 - Misses 70 72 +2 ``` | [Flag](https://app.codecov.io/gh/good-first-issues/good-first-issues.github.io/pull/190/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=good-first-issues) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/good-first-issues/good-first-issues.github.io/pull/190/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=good-first-issues) | `4.00% <0.00%> (-0.11%)` | :arrow_down: | 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=good-first-issues#carryforward-flags-in-the-pull-request-comment) to find out more.

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