chore(deps): update dependency sanity-plugin-asset-source-unsplash to v4 (#154)

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

Author: renovate[bot]

package-lock.json

@@ -26,7 +26,7 @@
     "react-dom": "^19.1.1",
     "rxjs": "^7.8.2",
     "sanity": "^4.5.0",
-    "sanity-plugin-asset-source-unsplash": "^3.1.0",
+    "sanity-plugin-asset-source-unsplash": "^4.0.1",
     "styled-components": "^6.1.19"
   },
   "devDependencies": {