fix(deps): update dependency magic-string to v0.30.21 (#2263)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [magic-string](https://redirect.github.com/Rich-Harris/magic-string) |
[`0.30.19` ->
`0.30.21`](https://renovatebot.com/diffs/npm/magic-string/0.30.19/0.30.21)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/magic-string/0.30.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/magic-string/0.30.19/0.30.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>Rich-Harris/magic-string (magic-string)</summary>

###
[`v0.30.21`](https://redirect.github.com/Rich-Harris/magic-string/blob/HEAD/CHANGELOG.md#03021-2025-10-24)

[Compare
Source](https://redirect.github.com/Rich-Harris/magic-string/compare/v0.30.19...v0.30.21)

</details>

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packages/unplugin/package.json

@@ -47,7 +47,7 @@
   },
   "dependencies": {
     "dotenv": "16.6.1",
-    "magic-string": "0.30.19",
+    "magic-string": "0.30.21",
     "object-hash": "3.0.0",
     "picocolors": "1.1.1",
     "unplugin": "2.3.10"