fix(deps): update dependency @sanity/preview-kit to ^6.0.3 (main) (#2394)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

packages/next-sanity/package.json

@@ -149,7 +149,7 @@
     "@portabletext/react": "^3.2.1",
     "@sanity/client": "^6.28.3",
     "@sanity/next-loader": "^1.3.7",
-    "@sanity/preview-kit": "^6.0.2",
+    "@sanity/preview-kit": "^6.0.3",
     "@sanity/preview-url-secret": "^2.1.6",
     "@sanity/visual-editing": "^2.13.12",
     "groq": "^3.79.0",