kafka.git: Error while running github feature from trunk:.asf.yaml

[Apache Infrastructure]

An error occurred while processing the github feature in .asf.yaml: 

when expecting a mapping
found arbitrary text
  in "kafka.git/.asf.yaml::github", line 21, column 1:
    protected_branches: '~'
    ^ (line: 21)

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With regards, ASF Infra.