chore(deps): update rust crate syn to 2.0.66

This MR contains the following updates:

Package	Type	Update	Change
syn	workspace.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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