RateLimitExceededException not raised when rate limit exceeds via making many PRs

When the rate limit is exceeded using by making too many PRs, the RateLimitExceededException is not raised, instead it is a GithubException. I would expect that it would be the rate limit exception, given it's a 403 and gives the rate limit exceeded exception:

403 {"documentation_url": "https://docs.github.com/en/free-pro-team@latest/rest/overview/resources-in-the-rest-api#secondary-rate-limits", "message": "You have exceeded a secondary rate limit. Please wait a few minutes before you try again."}

Example code:

def create_branch(repo, branch_name):
    sb = repo.get_branch(repo.default_branch)
    repo.create_git_ref(ref='refs/heads/' + branch_name, sha=sb.commit.sha)

def exceed():
    for i in range(100):
        repo = g.get_repo("mhoeger/test")
        branch = f"mhoeger/test-branch-{time.time()}"
        create_branch(repo, branch)
        repo.create_file("test.txt", "TEST!", "hi", branch)
        repo.create_pull("testing", "test", repo.default_branch, branch)

首先，使用會重複建立分支、檔案和 pull request 的範例重現 secondary-rate-limit 回應。追蹤 GitHub API 用戶端如何處理此 403 回應，並將其與 RateLimitExceededException 的處理進行比較。完成標準是：文件中所述的 secondary-rate-limit 回應引發 RateLimitExceededException，而不是 GithubException，且測試涵蓋此行為。