FIX: [okx] refine okx rate limiter

[bailantaotao]

request failed with status code: 429, body: "{\"msg\":\"Too Many Requests\",\"code\":\"50011\"

In the past, I allowed a maximum of N buckets in the rate limiter, but OKX seems to have a strict restriction, leading to issues with the rate limiter. Therefore, I have now updated the value to 1.

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[codecov[bot]]

Codecov Report

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

Comparison is base (7436a7e) 21.77% compared to head (f135b6d) 21.77%. Report is 7 commits behind head on main.

Additional details and impacted files

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Re-estimated karma: this pull request may get 222 BBG

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