{
  "released": "6.6.1",
  "stable": "6.6.1",
  "head": "6.6.1"
}

{
  "released": "6.7.0",
  "stable": "6.7.0",
  "head": "6.7.0"
}

Update release notes of Firebase CPP client to version 6.7.0
Update release notes of Firebase CPP client to version 6.7.0

PiperOrigin-RevId: 278659164
