Increase S3 retry count to 10

[jwodder]

See #81 (comment)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 34.56%. Comparing base (e0fd117) to head (fba738a).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/s3/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
- Coverage   34.60%   34.56%   -0.04%     
==========================================
  Files          14       14              
  Lines         997      998       +1     
==========================================
  Hits          345      345              
- Misses        652      653       +1     

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