class_docstr: Convert msg spec V4 to V5
class_docstr_tok: ["Convert","msg","spec","V4","to","V5"]
code: def update_header(self, msg):
      msg["header"]["version"] = self.version
      if msg["parent_header"]:
          msg["parent_header"]["version"] = self.version
      return msg
  
imports: import re
  import json
  from jupyter_client import protocol_version_info
label_desc: Use image node_id 1 for calling the V4toV5 obj's underlying member method code with example usage: obj.update_header(msg) and returns: msg