Update Rust crate syn to v2.0.74 (#578)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [syn](https://togithub.com/dtolnay/syn) | workspace.dependencies |
patch | `2.0.72` -> `2.0.74` |

---

### Release Notes

<details>
<summary>dtolnay/syn (syn)</summary>

### [`v2.0.74`](https://togithub.com/dtolnay/syn/releases/tag/2.0.74)

[Compare
Source](https://togithub.com/dtolnay/syn/compare/2.0.73...2.0.74)

- Fix *"temporary is dropped and runs the destructor for type \`impl
Iterator\`"* regression affecting certain use of `Generics` iterator
methods ([#&#8203;1719](https://togithub.com/dtolnay/syn/issues/1719))

### [`v2.0.73`](https://togithub.com/dtolnay/syn/releases/tag/2.0.73)

[Compare
Source](https://togithub.com/dtolnay/syn/compare/2.0.72...2.0.73)

- Support parsing unnamed C varargs within function pointer types
([#&#8203;1711](https://togithub.com/dtolnay/syn/issues/1711))
- Improve synthesized error message on unexpected tokens at the end of
the expected contents of a delimited group
([#&#8203;1713](https://togithub.com/dtolnay/syn/issues/1713))
- Support parsing unstable tail call syntax
([#&#8203;1714](https://togithub.com/dtolnay/syn/issues/1714),
[https://github.com/rust-lang/rust/issues/112788](https://togithub.com/rust-lang/rust/issues/112788))
- Add
[`Fields::members`](https://docs.rs/syn/2.0.73/syn/enum.Fields.html#method.members)
iterator ([#&#8203;1716](https://togithub.com/dtolnay/syn/issues/1716),
thanks [@&#8203;Fancyflame](https://togithub.com/Fancyflame))

</details>

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