Update zingolib to latest dev

[AArnott]

✨ This pull request encompasses a series of significant updates and improvements to the codebase, as detailed in the commit history. The key highlights include:

1. Integration Testing and Bug Fixes:

   • A new integration test was added to ensure the stability and functionality of the save buffer (d21c6d7f).
   • The do_delete function was modified to ensure proper compilation on mobile platforms (dfb77458).
   • A major fix was implemented in the add_save_buffer_to_lightclient to revamp save handles and enhance overall performance (56697419).

2. Code Optimization and Cleanup:

   • Unnecessary println statements were removed to clean up the code (34d1babd).
   • Modifications were made to mark unconfirmed_spent more accurately

zingolib diff

[codecov]

Codecov Report

Merging #139 (8df0b42) into main (0a18ddf) will increase coverage by 0.01%.
Report is 3 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #139      +/-   ##
==========================================
+ Coverage   75.95%   75.97%   +0.01%     
==========================================
  Files         148      148              
  Lines        8964     8968       +4     
  Branches      810      810              
==========================================
+ Hits         6809     6813       +4     
  Misses       1956     1956              
  Partials      199      199              

Flag	Coverage Δ
LinuxHost	75.97% <ø> (+0.01%)	⬆️
Release	75.97% <ø> (+0.01%)	⬆️
WindowsHost	75.97% <ø> (+0.01%)	⬆️
macOSHost	75.97% <ø> (+0.01%)	⬆️

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see 2 files with indirect coverage changes

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