{
  "released": "6.11.0",
  "stable": "6.11.0",
  "head": "6.11.0"
}

{
  "released": "6.12.0",
  "stable": "6.12.0",
  "head": "6.12.0"
}

Update Firebase C++ and Unity SDK versions to 6.12.0, plus Unity guids.
Update Firebase C++ and Unity SDK versions to 6.12.0, plus Unity guids.

PiperOrigin-RevId: 297705681
