Update postcss (forgejo) (go-gitea#6562)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [postcss](https://postcss.org/) ([source](https://github.com/postcss/postcss)) | dependencies | minor | [`8.4.49` -> `8.5.1`](https://renovatebot.com/diffs/npm/postcss/8.4.49/8.5.1) |
| [postcss-html](https://github.com/ota-meshi/postcss-html) | devDependencies | minor | [`1.7.0` -> `1.8.0`](https://renovatebot.com/diffs/npm/postcss-html/1.7.0/1.8.0) |

---

### Release Notes

<details>
<summary>postcss/postcss (postcss)</summary>

### [`v8.5.1`](https://github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#851)

[Compare Source](postcss/postcss@8.5.0...8.5.1)

-   Fixed backwards compatibility for complex cases (by [@&go-gitea#8203;romainmenke](https://github.com/romainmenke)).

### [`v8.5.0`](https://github.com/postcss/postcss/releases/tag/8.5.0): 8.5 “Duke Alloces”

[Compare Source](postcss/postcss@8.4.49...8.5.0)

<img src="https://github.com/user-attachments/assets/6ef654a0-d675-4ba0-a670-e28ef27062f5" align="right" width="200" height="200" alt="President Alloces seal">

PostCSS 8.5 brought API to work better with non-CSS sources like HTML, Vue.js/Svelte sources or CSS-in-JS.

[@&go-gitea#8203;romainmenke](https://github.com/romainmenke) during [his work](postcss/postcss#1995) on [Stylelint](https://stylelint.io) added `Input#document` in additional to `Input#css`.

```js
root.source.input.document //=> "<p>Hello</p>
                           //    <style>
                           //    p {
                           //      color: green;
                           //    }
                           //    </style>"
root.source.input.css      //=> "p {
                           //      color: green;
                           //    }"

```

#### Thanks to Sponsors

This release was possible thanks to our community.

If your company wants to support the sustainability of front-end infrastructure or wants to give some love to PostCSS, you can join our supporters by:

-   [**Tidelift**](https://tidelift.com/) with a Spotify-like subscription model supporting all projects from your lock file.
-   Direct donations at [**GitHub Sponsors**](https://github.com/sponsors/ai) or [**Open Collective**](https://opencollective.com/postcss#section-contributors).

</details>

<details>
<summary>ota-meshi/postcss-html (postcss-html)</summary>

### [`v1.8.0`](https://github.com/ota-meshi/postcss-html/releases/tag/v1.8.0)

[Compare Source](ota-meshi/postcss-html@v1.7.0...v1.8.0)

#### What's Changed

-   update to latest PostCSS by [@&go-gitea#8203;romainmenke](https://github.com/romainmenke) in ota-meshi/postcss-html#134

**Full Changelog**: ota-meshi/postcss-html@v1.7.0...v1.8.0

</details>

---

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---

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Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6562
Reviewed-by: Gusted <[email protected]>
Co-authored-by: Renovate Bot <[email protected]>
Co-committed-by: Renovate Bot <[email protected]>

Author: Renovate Bot

package-lock.json

@@ -36,7 +36,7 @@
     "monaco-editor": "0.52.2",
     "monaco-editor-webpack-plugin": "7.1.0",
     "pdfobject": "2.3.0",
-    "postcss": "8.4.49",
+    "postcss": "8.5.1",
     "postcss-loader": "8.1.1",
     "postcss-nesting": "13.0.1",
     "pretty-ms": "9.0.0",
@@ -88,7 +88,7 @@
     "happy-dom": "16.3.0",
     "license-checker-rseidelsohn": "4.4.2",
     "markdownlint-cli": "0.43.0",
-    "postcss-html": "1.7.0",
+    "postcss-html": "1.8.0",
     "stylelint": "16.12.0",
     "stylelint-declaration-block-no-ignored-properties": "2.8.0",
     "stylelint-declaration-strict-value": "1.10.6",