Update Rust crate syn to v2.0.106

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
syn	workspace.dependencies	patch	2.0.104 -> 2.0.106

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Release Notes

dtolnay/syn (syn)

v2.0.106

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• Replace ~const syntax with [const] conditionally const syntax in trait bounds (#​1896, rust-lang/rust#139858)
• Support conditionally const impl Trait types (#​1897)
• Reject polarity modifier and lifetime binder used in the same trait bound (#​1899, rust-lang/rust#127054)
• Parse const trait bounds with bound lifetimes (#​1902)
• Parse bound lifetimes with lifetime bounds (#​1903)
• Allow type parameters and const parameters in trait bounds and generic closures (#​1904, #​1907, #​1908, #​1909)

v2.0.105

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• Disallow "negative" inherent impls like impl !T {} (#​1881, rust-lang/rust#144386)

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