Avoid mkdir race conditions during psave

[zjwegert]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 62.80%. Comparing base (921f62f) to head (11bea63).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/Io.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   62.30%   62.80%   +0.49%     
==========================================
  Files          15       15              
  Lines        1483     1484       +1     
==========================================
+ Hits          924      932       +8     
+ Misses        559      552       -7     

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