Add .NET core target frameworks

Author: glopesdev

Bonsai.Scripting.Expressions.Tests/Bonsai.Scripting.Expressions.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net472</TargetFramework>
+    <TargetFrameworks>net472;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>

src/Bonsai.Scripting.Expressions.Design/Bonsai.Scripting.Expressions.Design.csproj

@@ -3,7 +3,7 @@
     <Description>This package provides editors for expression scripting in the Bonsai programming language.</Description>
     <PackageTags>$(PackageTags) Design</PackageTags>
     <UseWindowsForms>true</UseWindowsForms>
-    <TargetFramework>net472</TargetFramework>
+    <TargetFrameworks>net472;net8.0-windows</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Bonsai.Design" Version="2.9.0" />

src/Bonsai.Scripting.Expressions/Bonsai.Scripting.Expressions.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <Description>This package provides operators implementing expression scripting infrastructure.</Description>
-    <TargetFramework>net472</TargetFramework>
+    <TargetFrameworks>net472;net8.0</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Bonsai.Core" Version="2.9.0" />