fix(snapshots): panic: unaligned 64-bit atomic operation

[jkowalski]

Reverted to regular sync.Pool

Fixes #2150

[codecov]

Codecov Report

Merging #2151 (b1b6ac6) into master (04fe236) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2151      +/-   ##
==========================================
- Coverage   73.46%   73.43%   -0.04%     
==========================================
  Files         425      425              
  Lines       33003    33000       -3     
==========================================
- Hits        24245    24232      -13     
- Misses       6974     6984      +10     
  Partials     1784     1784              

Impacted Files	Coverage Δ
internal/freepool/freepool.go	100.00% <100.00%> (ø)
cli/command_content_verify.go	75.00% <0.00%> (-6.04%)	⬇️
repo/blob/throttling/throttling_semaphore.go	97.05% <0.00%> (-2.95%)	⬇️
repo/grpc_repository_client.go	75.45% <0.00%> (-0.67%)	⬇️
internal/epoch/epoch_manager.go	89.60% <0.00%> (-0.52%)	⬇️
snapshot/snapshotfs/upload.go	79.68% <0.00%> (+0.11%)	⬆️
repo/content/content_manager_iterate.go	91.71% <0.00%> (+2.20%)	⬆️

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[ptandler]

Great that you fixed this! ❤️ Already planned when a version with this fix will be released?