Add Net9

Author: patrick-dmxc

ArtNetSharp/ArtNetSharp.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
 	<PropertyGroup>
-		<TargetFrameworks>netstandard2.0;net6.0;net7.0;net8.0</TargetFrameworks>
+		<TargetFrameworks>netstandard2.0;net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
 		<PackageLicenseFile>LICENSE</PackageLicenseFile>
 		<Version>0.0.34</Version>
 		<RepositoryUrl>https://github.com/DMXControl/ArtNetSharp</RepositoryUrl>

ArtNetTests/ArtNetTests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-	<TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+	<TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
 	<LangVersion>preview</LangVersion>