build(deps): bump nextra from 2.2.18 to 2.2.19 (#5110)

Bumps [nextra](https://github.com/shuding/nextra) from 2.2.18 to 2.2.19.
- [Release notes](https://github.com/shuding/nextra/releases)
- [Changelog](https://github.com/shuding/nextra/blob/main/docs/CHANGELOG.md)
- [Commits](https://github.com/shuding/nextra/compare/[email protected]@2.2.19)

---
updated-dependencies:
- dependency-name: nextra
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

@@ -37,7 +37,7 @@
     "isomorphic-dompurify": "^1.1.0",
     "next": "^13.2.3",
     "next-sitemap": "^4.0.5",
-    "nextra": "^2.2.18",
+    "nextra": "^2.2.19",
     "node-version-data": "^1.1.0",
     "npm-run-all": "^4.1.5",
     "react": "^18.2.0",