nit: fixed benign test data race

[jkowalski]

No description provided.

[codecov]

Codecov Report

Merging #1635 (6827b42) into master (a223fb8) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1635      +/-   ##
==========================================
- Coverage   70.19%   70.13%   -0.07%     
==========================================
  Files         381      381              
  Lines       30240    30240              
==========================================
- Hits        21227    21208      -19     
- Misses       7378     7391      +13     
- Partials     1635     1641       +6     

Impacted Files	Coverage Δ
...napshot/snapshotmaintenance/snapshotmaintenance.go	70.00% <0.00%> (-30.00%)	⬇️
repo/maintenance/maintenance_schedule.go	66.37% <0.00%> (-7.76%)	⬇️
snapshot/snapshotgc/gc.go	67.64% <0.00%> (-5.89%)	⬇️
internal/server/server.go	66.23% <0.00%> (-1.71%)	⬇️
repo/content/content_manager.go	84.76% <0.00%> (-0.58%)	⬇️
repo/object/object_reader.go	78.53% <0.00%> (+1.46%)	⬆️
repo/content/content_manager_lock_free.go	73.88% <0.00%> (+2.23%)	⬆️
repo/content/content_cache_metadata.go	96.55% <0.00%> (+4.59%)	⬆️

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