[API Compat] Not targeting .NET 8 framework in versions 8.*

I am building a CI/CD pipeline using a .NET 8-based container image. In this pipeline, I have a validation step where I want to check for potential breaking changes and fail if any are detected. To my surprise, when I installed the Microsoft.DotNet.ApiCompat.Tool and tried to use it, it failed because it targets the .NET 6 framework, which I do not have installed.

```
apicompat --version
8.0.401+41b13414c4a35aac269719f7281cf74c9c9aae31
```
Installing the .NET 6 runtime makes the tool work (version 6.0.33):
```
wget https://dot.net/v1/dotnet-install.sh -O dotnet-install.sh
chmod +x dotnet-install.sh
./dotnet-install.sh --runtime dotnet --version 6.0.33
```
Question:

Why isn't there version parity between the API Compat tool version 8.* and its dependent framework?

When I check the API Compat tool version 8.0.4 on the NuGet Package Explorer, I see it has a dependency on .NET 6:

If I inspect a more recent version (e.g., .NET 9 RC), I notice it depends on the latest LTS version (.NET 8), whereas I was expecting it to depend on .NET 9:

I realize I might be missing something, but I would like to understand the rationale or reasons behind this discrepancy. Can you help?