[Docs Site] Bump eslint from 9.20.0 to 9.21.0 (#20236)

Bumps [eslint](https://github.com/eslint/eslint) from 9.20.0 to 9.21.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v9.20.0...v9.21.0)

---
updated-dependencies:
- dependency-name: eslint
  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

@@ -58,7 +58,7 @@
 		"dedent": "1.5.3",
 		"dompurify": "3.2.4",
 		"dot-prop": "9.0.0",
-		"eslint": "9.20.0",
+		"eslint": "9.21.0",
 		"eslint-plugin-astro": "1.3.1",
 		"eslint-plugin-jsx-a11y": "6.10.2",
 		"eslint-plugin-react": "7.37.4",