make rate limiter more concurrent-friendly

[Neur0toxine]

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[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (c80d4bf) 51.64% compared to head (885a16a) 56.25%.

❗ Current head 885a16a differs from pull request most recent head d7a6409. Consider uploading reports for the commit d7a6409 to get more accurate results

Files	Patch %	Lines
v1/rate_limit.go	76.00%	3 Missing and 3 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #117      +/-   ##
==========================================
+ Coverage   51.64%   56.25%   +4.60%     
==========================================
  Files          12       12              
  Lines         637      640       +3     
==========================================
+ Hits          329      360      +31     
+ Misses        244      212      -32     
- Partials       64       68       +4     

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