{
  "released": "6.6.0",
  "stable": "6.6.0",
  "head": "6.6.0"
}

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

Add 6.6.1 release notes, about the Future problem
Add 6.6.1 release notes, about the Future problem

PiperOrigin-RevId: 272989619
