Remove unneeded elements

Terminal.Gui/Terminal.Gui.csproj

@@ -57,11 +57,6 @@
   <ItemGroup>
     <InternalsVisibleTo Include="UnitTests" />
   </ItemGroup>
-  <PropertyGroup>
-    <!-- Uncomment the RestoreSources element to have dotnet restore pull NStack from a local dir for testing -->
-    <!-- See https://stackoverflow.com/a/44463578/297526 -->
-    <!--<RestoreSources>$(RestoreSources);..\..\NStack\NStack\bin\Debug;https://api.nuget.org/v3/index.json</RestoreSources>-->
-  </PropertyGroup>
   <!-- =================================================================== -->
   <!-- API Documentation -->
   <!-- =================================================================== -->

UnitTests/UnitTests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
     <!-- https://stackoverflow.com/questions/294216/why-does-c-sharp-forbid-generic-attribute-types -->
@@ -23,7 +23,6 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageReference Include="ReportGenerator" Version="5.2.1" />
-    <PackageReference Include="System.Collections" Version="4.3.0" />
     <PackageReference Include="TestableIO.System.IO.Abstractions.TestingHelpers" Version="20.0.15" />
     <PackageReference Include="xunit" Version="2.7.0" />
     <PackageReference Include="Xunit.Combinatorial" Version="1.6.24" />