fix(deps): update dependency @portabletext/editor to ^1.20.0 (#8208)

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

Author: renovate[bot]

dev/test-studio/package.json

@@ -16,7 +16,7 @@
     "workshop:dev": "node -r esbuild-register scripts/workshop/dev.ts"
   },
   "dependencies": {
-    "@portabletext/editor": "^1.19.0",
+    "@portabletext/editor": "^1.20.0",
     "@portabletext/react": "^3.0.0",
     "@sanity/assist": "^3.0.2",
     "@sanity/block-tools": "3.68.3",

packages/sanity/package.json

@@ -153,7 +153,7 @@
     "@dnd-kit/sortable": "^7.0.1",
     "@dnd-kit/utilities": "^3.2.0",
     "@juggle/resize-observer": "^3.3.1",
-    "@portabletext/editor": "^1.19.0",
+    "@portabletext/editor": "^1.20.0",
     "@portabletext/react": "^3.0.0",
     "@rexxars/react-json-inspector": "^9.0.1",
     "@sanity/asset-utils": "^2.0.6",