API rate limit status code is sometime 403 not only 429

[matthewnessworthy]

As per the example GitHub can return a status code 403 (instead of only 429) on API rate limit over-usage.

https://docs.github.com/en/rest/overview/resources-in-the-rest-api#checking-your-rate-limit-status

I experienced this issue myself via 2 different responses:

API rate limit

"exception": {
    "class": "Github\Exception\RuntimeException",
    "message": "API rate limit exceeded for installation ID xxxxxxx.",
    "code": 403,
    "file": "/var/task/vendor/knplabs/github-api/lib/Github/HttpClient/Plugin/GithubExceptionThrower.php:123"
}

Secondary rate limit

"exception": {
    "class": "Github\Exception\RuntimeException",
    "message": "You have exceeded a secondary rate limit. Please wait a few minutes before you try again.",
    "code": 403,
    "file": "/var/task/vendor/knplabs/github-api/lib/Github/HttpClient/Plugin/GithubExceptionThrower.php:123"
}