drop old frameworks from test target

Author: smdn

tests/Smdn.Reflection.ReverseGenerating.ListApi.Core/Smdn.Reflection.ReverseGenerating.ListApi.Core.Tests.csproj

@@ -5,7 +5,7 @@ SPDX-License-Identifier: MIT
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks Condition=" '$(EnableTargetFrameworkDotNet)' == 'true' ">net6.0</TargetFrameworks>
-    <TargetFrameworks Condition=" '$(EnableTargetFrameworkNetCoreApp)' == 'true' ">$(TargetFrameworks);netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(EnableTargetFrameworkNetCoreApp)' == 'true' ">$(TargetFrameworks)</TargetFrameworks>
     <TargetFrameworks Condition=" '$(EnableTargetFrameworkNetFx)' == 'true' ">$(TargetFrameworks)</TargetFrameworks>
     <RootNamespace>Smdn.Reflection.ReverseGenerating.ListApi.Core</RootNamespace>
     <NoWarn>CS2002;$(NoWarn)</NoWarn>

tests/Smdn.Reflection.ReverseGenerating/Smdn.Reflection.ReverseGenerating.Tests.csproj

@@ -5,8 +5,8 @@ SPDX-License-Identifier: MIT
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks Condition=" '$(EnableTargetFrameworkDotNet)' == 'true' ">net6.0</TargetFrameworks>
-    <TargetFrameworks Condition=" '$(EnableTargetFrameworkNetCoreApp)' == 'true' ">$(TargetFrameworks);netcoreapp3.1</TargetFrameworks>
-    <TargetFrameworks Condition=" '$(EnableTargetFrameworkNetFx)' == 'true' ">$(TargetFrameworks);net47;net45</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(EnableTargetFrameworkNetCoreApp)' == 'true' ">$(TargetFrameworks)</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(EnableTargetFrameworkNetFx)' == 'true' ">$(TargetFrameworks);net47</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <!-- do not use 'enable' or 'annotations': affects the behavior of the test cases -->
     <Nullable>warnings</Nullable>