chore(deps): update rust crate syn to v3.0.4 (#26032)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [syn](https://redirect.github.com/dtolnay/syn) |
workspace.dependencies | patch | `3.0.3` → `3.0.4` |

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### Release Notes

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

###
[`v3.0.4`](https://redirect.github.com/dtolnay/syn/releases/tag/3.0.4)

[Compare
Source](https://redirect.github.com/dtolnay/syn/compare/3.0.3...3.0.4)

- Allow `safe fn` in `impl Parse for ForeignItemFn`
([#&#8203;2078](https://redirect.github.com/dtolnay/syn/issues/2078))

</details>

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