[Docs Site] Bump @typescript-eslint/parser from 8.20.0 to 8.21.0 (cloudflare#19366)

Bumps [@typescript-eslint/parser](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/parser) from 8.20.0 to 8.21.0.
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/parser/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v8.21.0/packages/parser)

---
updated-dependencies:
- dependency-name: "@typescript-eslint/parser"
  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]

package-lock.json

@@ -47,7 +47,7 @@
 		"@types/node": "22.10.7",
 		"@types/react": "19.0.7",
 		"@types/react-dom": "19.0.3",
-		"@typescript-eslint/parser": "8.20.0",
+		"@typescript-eslint/parser": "8.21.0",
 		"algoliasearch": "5.19.0",
 		"astro": "4.16.18",
 		"astro-breadcrumbs": "3.3.1",