Remove NET9

Author: Deterous

XboxKit.csproj

@@ -5,7 +5,7 @@
     <OutputType>Exe</OutputType>
     <TargetName>xboxkit</TargetName>
     <AssemblyName>xboxkit</AssemblyName>
-    <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
     <RuntimeIdentifiers>win-x86;win-x64;win-arm64;linux-x64;linux-arm64;osx-x64;osx-arm64</RuntimeIdentifiers>
     <CheckEolTargetFramework>false</CheckEolTargetFramework>
     <LangVersion>latest</LangVersion>