code: def staging_branch(self) -> str:
      return f"staging-{self.version}"
  
file_path: bokeh/release/config.py
imports: from __future__ import annotations
  import re
  from .enums import VersionType
  from .logger import LOG, Scrubber
label_desc: Use image node_id 12 for calling the Config obj's underlying member method code with example usage: obj.staging_branch() and returns: str, self