[chore] Replace usage of puzpuzpuz/xsync with standard sync

[bogdandrutu]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 84.21053% with 3 lines in your changes missing coverage. Please review.

Project coverage is 91.29%. Comparing base (9a620a0) to head (50d6591).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...xporterhelper/internal/queuebatch/multi_batcher.go	84.21%	2 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (84.21%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13165      +/-   ##
==========================================
- Coverage   91.30%   91.29%   -0.01%     
==========================================
  Files         509      509              
  Lines       28730    28735       +5     
==========================================
+ Hits        26231    26233       +2     
- Misses       1986     1988       +2     
- Partials      513      514       +1     

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