fix: PermissionError swallowing in _atomic_save

[zhixiangli]

What does this PR do?

Fixes #21800

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87%. Comparing base (4819088) to head (b06d9b9).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21799   +/-   ##
=======================================
  Coverage      87%      87%           
=======================================
  Files         270      270           
  Lines       24010    24011    +1     
=======================================
+ Hits        20787    20789    +2     
+ Misses       3223     3222    -1