Fix lock issue in string node copy

[ray6080]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (deb1734) 91.20% compared to head (6032fbc) 91.21%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1811   +/-   ##
=======================================
  Coverage   91.20%   91.21%           
=======================================
  Files         777      777           
  Lines       28449    28450    +1     
=======================================
+ Hits        25948    25950    +2     
+ Misses       2501     2500    -1     

Impacted Files	Coverage Δ
src/storage/storage_structure/in_mem_file.cpp	71.74% <100.00%> (+0.12%)	⬆️

... and 1 file with indirect coverage changes

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