Update Rust crate syn to v2.0.111 (#21607)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [syn](https://redirect.github.com/dtolnay/syn) |
workspace.dependencies | patch | `2.0.110` -> `2.0.111` |

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### Release Notes

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

###
[`v2.0.111`](https://redirect.github.com/dtolnay/syn/releases/tag/2.0.111)

[Compare
Source](https://redirect.github.com/dtolnay/syn/compare/2.0.110...2.0.111)

- Allow first argument of `braced!`, `bracketed!`, `parenthesized!` to
be an otherwise unused variable
([#&#8203;1946](https://redirect.github.com/dtolnay/syn/issues/1946))

</details>

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Cargo.lock

@@ -3935,9 +3935,9 @@ checksum = "804f44ed3c63152de6a9f90acbea1a110441de43006ea51bcce8f436196a288b"
 
 [[package]]
 name = "syn"
-version = "2.0.110"
+version = "2.0.111"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a99801b5bd34ede4cf3fc688c5919368fea4e4814a4664359503e6015b280aea"
+checksum = "390cc9a294ab71bdb1aa2e99d13be9c753cd2d7bd6560c77118597410c4d2e87"
 dependencies = [
  "proc-macro2",
  "quote",