fix nuget versions

ErsatzTV.FFmpeg.Tests/ErsatzTV.FFmpeg.Tests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
         <TargetFramework>net6.0</TargetFramework>
@@ -13,6 +13,10 @@
         <PackageReference Include="Moq" Version="4.18.0" />
         <PackageReference Include="NUnit" Version="3.13.3" />
         <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
+        <PackageReference Include="System.IO.FileSystem.Primitives" Version="4.3.0" />
+        <PackageReference Include="System.Text.Encoding.Extensions" Version="4.3.0" />
+        <PackageReference Include="System.Runtime.Handles" Version="4.3.0" />
+        <PackageReference Include="System.Runtime.InteropServices" Version="4.3.0" />
         <PackageReference Include="coverlet.collector" Version="3.1.2">
           <PrivateAssets>all</PrivateAssets>
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>