Update version.json

Author: volllly

version.json

@@ -1,6 +1,6 @@
 {
-  "version": "2.0.0-rc.20",
+  "version": "2.0.0-rc.21",
   "releaseBranches": [
     "^refs/tags/v\\d+(?:\\.\\d+)*(?:-.*)?$"
   ]
-}
+}