[deps]: Update Rust crate syn to v2.0.90 (#53)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [syn](https://github.com/dtolnay/syn) | dependencies | patch
| `2.0.87` -> `2.0.90` |

---

### Release Notes

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

###
[`v2.0.90`](https://github.com/dtolnay/syn/releases/tag/2.0.90)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.89...2.0.90)

- Fix automatic parenthesization of subexpressions containing outer
attributes, such as `(#[attr] thing).field`
([#&#8203;1785](https://github.com/dtolnay/syn/issues/1785))
- Fix automatic parenthesization of function calls via a struct field,
such as `(thing.field)()` and `thing.0()`
([#&#8203;1786](https://github.com/dtolnay/syn/issues/1786))

###
[`v2.0.89`](https://github.com/dtolnay/syn/releases/tag/2.0.89)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.88...2.0.89)

- Fix *"compiler/fallback mismatch 949"* panic
([https://github.com/dtolnay/proc-macro2/issues/483](https://github.com/dtolnay/proc-macro2/issues/483))

###
[`v2.0.88`](https://github.com/dtolnay/syn/releases/tag/2.0.88)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.87...2.0.88)

- Improve error recovery in `parse_str`
([#&#8203;1783](https://github.com/dtolnay/syn/issues/1783))

</details>

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Daniel García <dani-garcia@users.noreply.github.com>