fix(deps): update dependency @portabletext/react to v5

Author: renovate[bot]

package.json

@@ -27,7 +27,7 @@
     "@babel/helpers": ">=7.28.4",
     "@emailjs/browser": "^4.4.1",
     "@hookform/resolvers": "^5.2.2",
-    "@portabletext/react": "^4.0.3",
+    "@portabletext/react": "^5.0.0",
     "@sanity/client": "^7.12.1",
     "@sanity/image-url": "^1.2.0",
     "@vercel/speed-insights": "^1.2.0",