chore(deps): update dependency @sanity/client to v7

Author: renovate[bot]

package-lock.json

@@ -14,7 +14,7 @@
   },
   "dependencies": {
     "@next/env": "15.3.0",
-    "@sanity/client": "6.29.0",
+    "@sanity/client": "7.0.0",
     "@sanity/demo": "2.0.0",
     "@sanity/icons": "3.7.0",
     "@sanity/image-url": "1.1.0",