Update Rust crate syn to v2.0.111 (#16903)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [syn](https://redirect.github.com/dtolnay/syn) |
workspace.dependencies | patch | `2.0.108` -> `2.0.111` |

---

### 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))

###
[`v2.0.110`](https://redirect.github.com/dtolnay/syn/releases/tag/2.0.110)

[Compare
Source](https://redirect.github.com/dtolnay/syn/compare/2.0.109...2.0.110)

- Tweaks to improve build speed
([#&#8203;1939](https://redirect.github.com/dtolnay/syn/issues/1939),
thanks [@&#8203;dishmaker](https://redirect.github.com/dishmaker))
- Make `syn::ext::IdentExt::unraw` available without "parsing" feature
([#&#8203;1940](https://redirect.github.com/dtolnay/syn/issues/1940))
- Support parsing `syn::Meta` followed by `=>`
([#&#8203;1944](https://redirect.github.com/dtolnay/syn/issues/1944))

###
[`v2.0.109`](https://redirect.github.com/dtolnay/syn/releases/tag/2.0.109)

[Compare
Source](https://redirect.github.com/dtolnay/syn/compare/2.0.108...2.0.109)

- Tweaks to improve build speed
([#&#8203;1927](https://redirect.github.com/dtolnay/syn/issues/1927),
[#&#8203;1928](https://redirect.github.com/dtolnay/syn/issues/1928),
[#&#8203;1930](https://redirect.github.com/dtolnay/syn/issues/1930),
[#&#8203;1932](https://redirect.github.com/dtolnay/syn/issues/1932),
[#&#8203;1934](https://redirect.github.com/dtolnay/syn/issues/1934),
thanks [@&#8203;dishmaker](https://redirect.github.com/dishmaker))

</details>

---

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Cargo.lock

@@ -4503,9 +4503,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.108"
+version = "2.0.111"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da58917d35242480a05c2897064da0a80589a2a0476c9a3f2fdc83b53502e917"
+checksum = "390cc9a294ab71bdb1aa2e99d13be9c753cd2d7bd6560c77118597410c4d2e87"
 dependencies = [
  "proc-macro2",
  "quote",