fix(deps): update nextra monorepo to v3.3.1

Author: renovate[bot]

package.json

@@ -40,8 +40,8 @@
     "next-query-params": "^5.0.0",
     "next-sitemap": "^4.2.3",
     "next-with-less": "^3.0.1",
-    "nextra": "3.0.0-alpha.28",
-    "nextra-theme-docs": "3.0.0-alpha.28",
+    "nextra": "3.3.1",
+    "nextra-theme-docs": "3.3.1",
     "numbro": "2.5.0",
     "p-limit": "^4.0.0",
     "parser-front-matter": "1.6.4",