Eliminate .NET Standard 2.0 build of nunit.engine.core

build.cake

@@ -125,7 +125,6 @@ BuildSettings.Packages.AddRange(new PackageDefinition[] {
                 "nunit.core.dll", "nunit.core.interfaces.dll", "nunit.engine.api.dll", 
                 "nunit.v2.driver.dll", "nunit-project-loader.dll", "nunit-v2-result-writer.dll", 
                 "teamcity-event-listener.dll", "vs-project-loader.dll"),
-            HasDirectory("bin/netstandard2.0").WithFiles(ENGINE_CORE_FILES).AndFiles(ENGINE_CORE_PDB_FILES),
             HasDirectory("bin/netcoreapp3.1").WithFiles(ENGINE_CORE_FILES).AndFiles(ENGINE_CORE_PDB_FILES),
             HasDirectory("bin/agents/net462").WithFiles(AGENT_FILES).AndFiles(AGENT_PDB_FILES),
             HasDirectory("bin/agents/net6.0").WithFiles(AGENT_FILES_NETCORE).AndFiles(AGENT_PDB_FILES_NETCORE),

src/NUnitEngine/nunit.engine.core/nunit.engine.core.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <RootNamespace>NUnit.Engine</RootNamespace>
-    <TargetFrameworks>net462;netstandard2.0;netcoreapp3.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net462;netcoreapp3.1;net6.0;net8.0</TargetFrameworks>
     <NoWarn>$(NoWarn);SYSLIB0011;SYSLIB0012</NoWarn><!-- TODO: Get rid of obsolete stuff -->
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>..\..\nunit.snk</AssemblyOriginatorKeyFile>
@@ -22,10 +22,6 @@
     <Reference Include="System.Web" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
-    <PackageReference Include="Microsoft.Win32.Registry" Version="4.3.0" />
-  </ItemGroup>
-
   <ItemGroup Condition="'$(TargetFramework)'=='netcoreapp3.1' or '$(TargetFramework)'=='net5.0' or '$(TargetFramework)'=='net6.0' or '$(TargetFramework)'=='net7.0' or '$(TargetFramework)'=='net8.0'">
     <PackageReference Include="Microsoft.Win32.Registry" Version="4.3.0" />
     <PackageReference Include="Microsoft.Extensions.DependencyModel" Version="3.1.0" />