Update Rust crate syn to v2.0.88

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
syn	dependencies	patch	2.0.87 -> 2.0.88
syn	build-dependencies	patch	2.0.87 -> 2.0.88

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Release Notes

dtolnay/syn (syn)

### [`v2.0.88`](https://redirect.github.com/dtolnay/syn/releases/tag/2.0.88) [Compare Source](https://redirect.github.com/dtolnay/syn/compare/2.0.87...2.0.88) - Improve error recovery in `parse_str` ([#​1783](https://redirect.github.com/dtolnay/syn/issues/1783))

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