chore: bump @docusaurus/tsconfig from 3.8.1 to 3.9.1 in /site (#377)

Bumps [@docusaurus/tsconfig](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus-tsconfig) 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-tsconfig)

---
updated-dependencies:
- dependency-name: "@docusaurus/tsconfig"
  dependency-version: 3.9.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

site/package-lock.json

@@ -31,7 +31,7 @@
     "@babel/eslint-parser": "^7.28.4",
     "@docusaurus/eslint-plugin": "^3.9.1",
     "@docusaurus/module-type-aliases": "3.9.1",
-    "@docusaurus/tsconfig": "3.8.1",
+    "@docusaurus/tsconfig": "3.9.1",
     "@docusaurus/types": "3.8.1",
     "@eslint/js": "^9.36.0",
     "eslint-plugin-jest": "^29.0.1",