chore(deps): lock file maintenance appengine-frontend (#2504)

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This PR contains the following updates:

| Package | Type | Update | Change | Age | Adoption | Passing |
Confidence |
|---|---|---|---|---|---|---|---|
|  |  | lockFileMaintenance | All locks refreshed |  |  |  |  |
|
[mini-css-extract-plugin](https://togithub.com/webpack-contrib/mini-css-extract-plugin)
| devDependencies | patch | [`2.9.0` ->
`2.9.1`](https://renovatebot.com/diffs/npm/mini-css-extract-plugin/2.9.0/2.9.1)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/mini-css-extract-plugin/2.9.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/mini-css-extract-plugin/2.9.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/mini-css-extract-plugin/2.9.0/2.9.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

🔧 This Pull Request updates lock files to use the latest dependency
versions.

---

### Release Notes

<details>
<summary>webpack-contrib/mini-css-extract-plugin
(mini-css-extract-plugin)</summary>

###
[`v2.9.1`](https://togithub.com/webpack-contrib/mini-css-extract-plugin/blob/HEAD/CHANGELOG.md#291-2024-08-19)

[Compare
Source](https://togithub.com/webpack-contrib/mini-css-extract-plugin/compare/v2.9.0...v2.9.1)

</details>

---

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gcp/appengine/frontend3/package.json

@@ -22,7 +22,7 @@
     "copy-webpack-plugin": "10.2.4",
     "css-loader": "6.11.0",
     "html-webpack-plugin": "5.6.0",
-    "mini-css-extract-plugin": "2.9.0",
+    "mini-css-extract-plugin": "2.9.1",
     "raw-loader": "4.0.2",
     "sass": "1.77.8",
     "sass-loader": "12.6.0",