Bump @docusaurus/preset-classic from 3.8.1 to 3.9.1

Bumps [@docusaurus/preset-classic](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus-preset-classic) from 3.8.1 to 3.9.1.
- [Release notes](https://github.com/facebook/docusaurus/releases)
- [Changelog](https://github.com/facebook/docusaurus/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/docusaurus/commits/v3.9.1/packages/docusaurus-preset-classic)

---
updated-dependencies:
- dependency-name: "@docusaurus/preset-classic"
  dependency-version: 3.9.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -20,7 +20,7 @@
     "@docusaurus/core": "^3.8.1",
     "@docusaurus/plugin-client-redirects": "^3.8.1",
     "@docusaurus/plugin-google-gtag": "^3.8.1",
-    "@docusaurus/preset-classic": "^3.8.1",
+    "@docusaurus/preset-classic": "^3.9.1",
     "@docusaurus/theme-common": "^3.8.0",
     "@docusaurus/faster": "^3.8.1",
     "@mdx-js/react": "^3.1.1",