chore(deps): update dependency @docsearch/js to v4

Author: renovate[bot]

package-lock.json

@@ -30,7 +30,7 @@
   "devDependencies": {
     "@babel/types": "^7.0.0",
     "@docsearch/css": "^3.0.0",
-    "@docsearch/js": "^3.0.0",
+    "@docsearch/js": "^4.0.0",
     "@floating-ui/dom": "^1.0.0",
     "@next/mdx": "^15.0.0",
     "@node-loader/core": "^2.0.0",