fix(deps): update dependency slate to v0.59.0

Author: renovate-bot

package-lock.json

@@ -53,7 +53,7 @@
     "react-select": "3.1.0",
     "shelljs": "0.8.4",
     "shortid": "2.2.15",
-    "slate": "0.47.9",
+    "slate": "0.59.0",
     "slate-collapse-on-escape": "0.8.1",
     "slate-html-serializer": "0.8.13",
     "slate-plain-serializer": "0.7.13",