build(deps): Bump @docusaurus/preset-classic

Bumps [@docusaurus/preset-classic](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus-preset-classic) from 2.0.0-beta.4 to 2.0.0-beta.5.
- [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/v2.0.0-beta.5/packages/docusaurus-preset-classic)

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

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

package.json

@@ -13,7 +13,7 @@
   },
   "dependencies": {
     "@docusaurus/core": "2.0.0-beta.4",
-    "@docusaurus/preset-classic": "2.0.0-beta.4",
+    "@docusaurus/preset-classic": "2.0.0-beta.5",
     "@mdx-js/react": "^1.6.22",
     "clsx": "^1.1.1",
     "react": "^17.0.2",