Update Rust crate unicode-ident to v1.0.18 (#16592)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [unicode-ident](https://redirect.github.com/dtolnay/unicode-ident) |
workspace.dependencies | patch | `1.0.17` -> `1.0.18` |

---

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### Release Notes

<details>
<summary>dtolnay/unicode-ident (unicode-ident)</summary>

###
[`v1.0.18`](https://redirect.github.com/dtolnay/unicode-ident/releases/tag/1.0.18)

[Compare
Source](https://redirect.github.com/dtolnay/unicode-ident/compare/1.0.17...1.0.18)

-   Documentation improvements

</details>

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Cargo.lock

@@ -4087,9 +4087,9 @@ dependencies = [
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.17"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "00e2473a93778eb0bad35909dff6a10d28e63f792f16ed15e404fca9d5eeedbe"
+checksum = "5a5f39404a5da50712a4c1eecf25e90dd62b613502b7e925fd4e4d19b5c96512"
 
 [[package]]
 name = "unicode-normalization"