remove net5.0 from target frameworks

Author: smdn

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

@@ -29,7 +29,7 @@ SPDX-License-Identifier: MIT
   </ImportGroup>
   <ImportGroup Condition=" '%24(MSBuildRuntimeType)' == 'Core' and %24([System.Runtime.InteropServices.RuntimeInformation]::FrameworkDescription.StartsWith('.NET 5.')) ">
     <!-- .NET 5.x -->
-    @(TaskFiles->WithMetadataValue('TargetFramework', 'net5.0')->'%(ImportLine)', '%0D%0A    ')
+    @(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 -->

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;net5.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net6.0;netcoreapp3.1</TargetFrameworks>
     <RootNamespace>Smdn.Reflection.ReverseGenerating.ListApi.MSBuild.Tasks</RootNamespace>
     <VersionPrefix>1.1.0</VersionPrefix>
     <VersionSuffix></VersionSuffix>