.NET 6 has reached end of life

[xtqqczze]

warning NETSDK1138: The target framework 'net6.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.

~/runtime/.dotnet/sdk/10.0.100-rc.1.25420.111/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.EolTargetFrameworks.targets(32,5): warning NETSDK1138: The target framework 'net6.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.
~/runtime/.dotnet/sdk/10.0.100-rc.1.25420.111/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.EolTargetFrameworks.targets(32,5): warning NETSDK1138: The target framework 'net7.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.
~/runtime/.dotnet/sdk/10.0.100-rc.1.25420.111/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.EolTargetFrameworks.targets(32,5): warning NETSDK1138: The target framework 'net6.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.
~/runtime/.dotnet/sdk/10.0.100-rc.1.25420.111/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.EolTargetFrameworks.targets(32,5): warning NETSDK1138: The target framework 'net7.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.

cc: @adamsitnik

[caaavik-msft]

I've opted to resolve this by suppressing the warning in #4982 for now. We don't run automated measurements on the older .NET versions, but it's still nice to keep it there to ensure that they at least can still be run if needed.