add support for .NET 8.0

Author: smdn

src/Smdn.Reflection.ReverseGenerating.ListApi.MSBuild.Tasks/GenerateMSBuildTargetsFile.targets

@@ -39,6 +39,10 @@ SPDX-License-Identifier: MIT
     <!-- .NET 7.x -->
     @(TaskFiles->WithMetadataValue('TargetFramework', 'net6.0')->'%(ImportLine)', '%0D%0A    ')
   </ImportGroup>
+  <ImportGroup Condition=" '%24(MSBuildRuntimeType)' == 'Core' and %24([System.Runtime.InteropServices.RuntimeInformation]::FrameworkDescription.StartsWith('.NET 8.')) ">
+    <!-- .NET 8.x -->
+    @(TaskFiles->WithMetadataValue('TargetFramework', 'net8.0')->'%(ImportLine)', '%0D%0A    ')
+  </ImportGroup>
 </Project>
       ]]></GenerateMSBuildTargetsFileLines>
     </PropertyGroup>

src/Smdn.Reflection.ReverseGenerating.ListApi.MSBuild.Tasks/Smdn.Reflection.ReverseGenerating.ListApi.MSBuild.Tasks.csproj

@@ -4,7 +4,7 @@ SPDX-License-Identifier: MIT
 -->
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net6.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net8.0;net6.0;netcoreapp3.1</TargetFrameworks>
     <RootNamespace>Smdn.Reflection.ReverseGenerating.ListApi.MSBuild.Tasks</RootNamespace>
     <VersionPrefix>1.2.2</VersionPrefix>
     <VersionSuffix></VersionSuffix>

src/Smdn.Reflection.ReverseGenerating.ListApi.MSBuild.Tasks/private/Smdn.Reflection.ReverseGenerating.ListApi.Core.csproj

@@ -4,7 +4,7 @@ SPDX-License-Identifier: MIT
 -->
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net6.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net8.0;net6.0;netcoreapp3.1</TargetFrameworks>
   </PropertyGroup>
 
   <Import Project="..\..\Smdn.Reflection.ReverseGenerating.ListApi.Core\Smdn.Reflection.ReverseGenerating.ListApi.Core.Common.props" />