Update ServiceStack.Text.Core.csproj

Author: mythz

src/ServiceStack.Text/ServiceStack.Text.Core.csproj

@@ -25,8 +25,5 @@
     <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="1.1.1" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'net6.0' ">
-    <PackageReference Include="System.Runtime" Version="4.3.1" />
-    <PackageReference Include="System.Reflection.Emit" Version="4.7.0" />
-    <PackageReference Include="System.Reflection.Emit.LightWeight" Version="4.7.0" />
   </ItemGroup>
 </Project>