Remove unnecessary test dependencies that were causing version conflicts

Author: Erik-White

tests/Directory.Build.targets

@@ -20,8 +20,6 @@
     <PackageReference Update="BenchmarkDotNet" Version="0.15.8" />
     <PackageReference Update="Magick.NET-Q16-AnyCPU" Version="14.10.2" />
     <PackageReference Update="Moq" Version="4.20.72" />
-    <PackageReference Update="Microsoft.DotNet.RemoteExecutor" Version="11.0.0-beta.26078.1" />
-    <PackageReference Update="Microsoft.DotNet.XUnitExtensions" Version="11.0.0-beta.26078.1" />
     <PackageReference Update="System.Drawing.Common" Version="10.0.2" />
     <PackageReference Update="Veldrid.ImageSharp" Version="4.9.0" />
     <PackageReference Update="Veldrid.ImGui" Version="5.72.0" />

tests/ImageSharp.Textures.Tests/ImageSharp.Textures.Tests.csproj

@@ -13,8 +13,6 @@
     <PackageReference Include="Magick.NET-Q16-AnyCPU" />
     <PackageReference Include="System.Drawing.Common" />
     <PackageReference Include="Moq" />
-    <PackageReference Include="Microsoft.DotNet.RemoteExecutor" />
-    <PackageReference Include="Microsoft.DotNet.XUnitExtensions" />
   </ItemGroup>
 
   <ItemGroup>