chore: make limiter's end function idempotent

[atzoum]

Description

Limiter's end function can be now called multiple times

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.10 🎉

Comparison is base (5f83762) 78.00% compared to head (6cf22d0) 78.10%.

❗ Current head 6cf22d0 differs from pull request most recent head 47d3f7b. Consider uploading reports for the commit 47d3f7b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
+ Coverage   78.00%   78.10%   +0.10%     
==========================================
  Files          67       67              
  Lines        4815     4819       +4     
==========================================
+ Hits         3756     3764       +8     
+ Misses        861      856       -5     
- Partials      198      199       +1     

Impacted Files	Coverage Δ
sync/limiter.go	92.10% <100.00%> (+0.21%)	⬆️

... and 5 files with indirect coverage changes

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