build(deps): bump @docusaurus/preset-classic in /website (#791)

Bumps [@docusaurus/preset-classic](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus-preset-classic) from 2.0.0-alpha.73 to 2.0.0-alpha.74.
- [Release notes](https://github.com/facebook/docusaurus/releases)
- [Changelog](https://github.com/facebook/docusaurus/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/docusaurus/commits/v2.0.0-alpha.74/packages/docusaurus-preset-classic)

Signed-off-by: dependabot[bot] <support@github.com>

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

website/package.json

@@ -11,7 +11,7 @@
         "serve": "docusaurus serve"
     },
     "dependencies": {
-        "@docusaurus/preset-classic": "2.0.0-alpha.73",
+        "@docusaurus/preset-classic": "2.0.0-alpha.74",
         "@mdx-js/react": "^1.6.22",
         "clsx": "^1.1.1",
         "postcss": "^8.2.13",