fix: update snapshot after conflict check

[ion-elgreco]

Description

Currently with multiple retries we would conflict check the same versions because our starting point (read_snapshot) is never updated after conflict resolution, this could be costly with many concurrent writers.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 72.32%. Comparing base (da8327d) to head (d1786fe).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/core/src/operations/transaction/mod.rs	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3205      +/-   ##
==========================================
+ Coverage   72.31%   72.32%   +0.01%     
==========================================
  Files         138      138              
  Lines       45751    45754       +3     
  Branches    45751    45754       +3     
==========================================
+ Hits        33083    33090       +7     
- Misses      10579    10581       +2     
+ Partials     2089     2083       -6     

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[ion-elgreco]

@rtyler could you re-approve? : )