Update Rust crate syn to v2.0.116 (#18140)
This PR contains the following updates:
| Package | Type | Update | Change | Pending |
|---|---|---|---|---|
| [syn](https://redirect.github.com/dtolnay/syn) |
workspace.dependencies | patch | `2.0.114` → `2.0.116` | `2.0.117` |
---
### Release Notes
<details>
<summary>dtolnay/syn (syn)</summary>
###
[`v2.0.116`](https://redirect.github.com/dtolnay/syn/releases/tag/2.0.116)
[Compare
Source](https://redirect.github.com/dtolnay/syn/compare/2.0.115...2.0.116)
- Optimize parse\_fn\_arg\_or\_variadic for less lookahead on erroneous
receiver
([#​1968](https://redirect.github.com/dtolnay/syn/issues/1968))
###
[`v2.0.115`](https://redirect.github.com/dtolnay/syn/releases/tag/2.0.115)
[Compare
Source](https://redirect.github.com/dtolnay/syn/compare/2.0.114...2.0.115)
- Enable GenericArgument::Constraint parsing in non-full mode
([#​1966](https://redirect.github.com/dtolnay/syn/issues/1966))
</details>
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