Fix the infinite looping bug in file uploading and downloading

[zhaoyuyoung]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.17%. Comparing base (60c9b84) to head (3f6525c).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
python/lsst/ctrl/bps/panda/utils.py	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
+ Coverage   37.06%   37.17%   +0.11%     
==========================================
  Files          13       13              
  Lines        1330     1326       -4     
  Branches      214      214              
==========================================
  Hits          493      493              
+ Misses        816      812       -4     
  Partials       21       21              

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