sync: use HEAD instead of LIST for single object

[davies]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 55.42%. Comparing base (47544a8) to head (e34d0b3).

Files	Patch %	Lines
pkg/sync/sync.go	0.00%	21 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4623      +/-   ##
==========================================
- Coverage   55.46%   55.42%   -0.04%     
==========================================
  Files         160      160              
  Lines       43060    43082      +22     
==========================================
- Hits        23884    23880       -4     
- Misses      16513    16537      +24     
- Partials     2663     2665       +2     

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