fix: depreciate allowClientClassCreation defaulting to true (#7925)

src/Deprecator/Deprecations.js

@@ -23,4 +23,5 @@ module.exports = [
       "Additionally, the environment variable 'PARSE_SERVER_ENABLE_EXPERIMENTAL_DIRECT_ACCESS' will be deprecated and renamed to 'PARSE_SERVER_DIRECT_ACCESS' in a future version; it is currently possible to use either one.",
   },
   { optionKey: 'enforcePrivateUsers', changeNewDefault: 'true' },
+  { optionKey: 'allowClientClassCreation', changeNewDefault: 'false' },
 ];