Update Rust crate syn to v3.0.8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
syn	build-dependencies	patch	3.0.6 → 3.0.8

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Release Notes

dtolnay/syn (syn)

v3.0.8

Compare Source

• Fix parsing of <- and -> tokens in expressions (#​2086, #​2087)

v3.0.7

Compare Source

• Fix parsing absolute path expr in labeled break (#​2085, thanks @​A4-Tacks)

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