Merge pull request #9051 from AriaXLi/PUP-10928/allow_pson_serialization_setting

(PUP-10928) Fix missing :

Author: mhashizume

lib/puppet/indirector/catalog/json.rb

@@ -18,7 +18,7 @@ def from_json(text)
   def to_json(object)
     object.render(json_format)
   rescue Puppet::Network::FormatHandler::FormatError => err
-    if Puppet[allow_pson_serialization]
+    if Puppet[:allow_pson_serialization]
       Puppet.info(_("Unable to serialize catalog to json, retrying with pson. PSON is deprecated and will be removed in a future release"))
       Puppet.log_exception(err, err.message, level: :debug)
       object.render('pson').force_encoding(Encoding::BINARY)