fix(deps): update dependency @graphiql/plugin-explorer to v4

Author: renovate[bot]

packages/graphiql/package.json

@@ -33,7 +33,7 @@
     "start": "vite"
   },
   "dependencies": {
-    "@graphiql/plugin-explorer": "^3.0.0",
+    "@graphiql/plugin-explorer": "^4.0.0",
     "@graphiql/toolkit": "0.11.1",
     "@graphql-tools/url-loader": "^8.0.15",
     "graphiql": "3.1.1",