drop target framework netcoreapp3.1 and net5.0

Author: smdn

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

@@ -23,14 +23,6 @@ SPDX-License-Identifier: MIT
       <!-- TODO: MSBuildRuntimeType == Full, Mono and otherwise -->
       <GenerateMSBuildTargetsFileLines><![CDATA[
 <Project>
-  <ImportGroup Condition=" '%24(MSBuildRuntimeType)' == 'Core' and %24([System.Runtime.InteropServices.RuntimeInformation]::FrameworkDescription.StartsWith('.NET Core 3.')) ">
-    <!-- .NET Core 3.x -->
-    @(TaskFiles->WithMetadataValue('TargetFramework', 'netcoreapp3.1')->'%(ImportLine)', '%0D%0A    ')
-  </ImportGroup>
-  <ImportGroup Condition=" '%24(MSBuildRuntimeType)' == 'Core' and %24([System.Runtime.InteropServices.RuntimeInformation]::FrameworkDescription.StartsWith('.NET 5.')) ">
-    <!-- .NET 5.x -->
-    @(TaskFiles->WithMetadataValue('TargetFramework', 'netcoreapp3.1')->'%(ImportLine)', '%0D%0A    ')
-  </ImportGroup>
   <ImportGroup Condition=" '%24(MSBuildRuntimeType)' == 'Core' and %24([System.Runtime.InteropServices.RuntimeInformation]::FrameworkDescription.StartsWith('.NET 6.')) ">
     <!-- .NET 6.x -->
     @(TaskFiles->WithMetadataValue('TargetFramework', 'net6.0')->'%(ImportLine)', '%0D%0A    ')

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>net8.0;net6.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net8.0;net6.0</TargetFrameworks>
     <RootNamespace>Smdn.Reflection.ReverseGenerating.ListApi.MSBuild.Tasks</RootNamespace>
     <VersionPrefix>1.3.2</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>net8.0;net6.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net8.0;net6.0</TargetFrameworks>
   </PropertyGroup>
 
   <Import Project="..\..\Smdn.Reflection.ReverseGenerating.ListApi.Core\Smdn.Reflection.ReverseGenerating.ListApi.Core.Common.props" />