fix: update plate dependencies

packages/core/package.json

@@ -84,9 +84,9 @@
     "@styled-icons/material-rounded": "10.47.0",
     "@styled-icons/remix-editor": "10.46.0",
     "@styled-icons/simple-icons": "10.46.0",
-    "@udecode/plate": "20.6.5",
-    "@udecode/plate-juice": "20.4.0",
-    "@udecode/plate-serializer-md": "20.4.1",
+    "@udecode/plate": "21.1.4",
+    "@udecode/plate-juice": "21.0.0",
+    "@udecode/plate-serializer-md": "21.0.0",
     "@uiw/codemirror-extensions-langs": "4.19.16",
     "@uiw/react-codemirror": "4.19.16",
     "ajv": "8.12.0",
@@ -156,10 +156,10 @@
     "sanitize-filename": "1.6.3",
     "scheduler": "0.23.0",
     "semaphore": "1.1.0",
-    "slate": "0.94.0",
+    "slate": "0.94.1",
     "slate-history": "0.93.0",
     "slate-hyperscript": "0.77.0",
-    "slate-react": "0.94.0",
+    "slate-react": "0.94.2",
     "stream-browserify": "3.0.0",
     "styled-components": "5.3.10",
     "symbol-observable": "4.0.0",