fix(deps): update rust crate syn to v2.0.66

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
syn	dependencies	patch	2.0.65 -> 2.0.66

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Release Notes

dtolnay/syn (syn)

v2.0.66

Compare Source

• Allow braced structs when parsing ExprLet (#​1671)

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.63%. Comparing base (7055d5d) to head (2851b20).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #275   +/-   ##
=======================================
  Coverage   80.63%   80.63%           
=======================================
  Files         213      213           
  Lines       12229    12229           
  Branches    12229    12229           
=======================================
  Hits         9861     9861           
- Misses       1727     1728    +1     
+ Partials      641      640    -1     

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