Update Rust crate annotate-snippets to v0.12.15 (#1955)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[annotate-snippets](https://redirect.github.com/rust-lang/annotate-snippets-rs)
| workspace.dependencies | patch | `0.12.14` → `0.12.15` |

---

### Release Notes

<details>
<summary>rust-lang/annotate-snippets-rs (annotate-snippets)</summary>

###
[`v0.12.15`](https://redirect.github.com/rust-lang/annotate-snippets-rs/blob/HEAD/CHANGELOG.md#01215---2026-04-06)

[Compare
Source](https://redirect.github.com/rust-lang/annotate-snippets-rs/compare/0.12.14...0.12.15)

##### Fixed

- Source highlighting no longer misaligns when source contains
zero-width or multi-width characters
[#&#8203;400](https://redirect.github.com/rust-lang/annotate-snippets-rs/pull/400)

</details>

---

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Cargo.lock

@@ -50,9 +50,9 @@ dependencies = [
 
 [[package]]
 name = "annotate-snippets"
-version = "0.12.14"
+version = "0.12.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22b669bf35e50f130e98212b486b0df78d93e285963344e58937692705e1a21a"
+checksum = "92570a3f9c98e7e84df84b71d0965ac99b1871fcd75a3773a3bd1bad13f64cf7"
 dependencies = [
  "anstyle",
  "memchr",