fix(deps): update nextra monorepo to v4

Author: renovate[bot]

package.json

@@ -11,8 +11,8 @@
 	"license": "MIT",
 	"dependencies": {
 		"next": "^13.5.1",
-		"nextra": "^2.4.2",
-		"nextra-theme-docs": "^2.4.2",
+		"nextra": "^4.0.0",
+		"nextra-theme-docs": "^4.0.0",
 		"react": "^18.2.0",
 		"react-dom": "^18.2.0"
 	},