Fix some unit test issues

+semver: skip

Author: Krusen

BencodeNET.Tests/BencodeNET.Tests.csproj

@@ -22,12 +22,13 @@
     <PackageReference Include="AutoFixture.AutoNSubstitute" Version="3.50.3" />
     <PackageReference Include="AutoFixture.Xunit2" Version="3.50.3" />
     <PackageReference Include="FluentAssertions" Version="4.19.3" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.3.0" />
     <PackageReference Include="NSubstitute" Version="2.0.3" />
-    <PackageReference Include="xunit" Version="2.3.0-beta3-build3705" />
-    <PackageReference Include="xunit.core" Version="2.3.0-beta3-build3705" />
-    <PackageReference Include="xunit.extensibility.execution" Version="2.3.0-beta3-build3705" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.0-beta3-build3705" />
-    <DotNetCliToolReference Include="dotnet-xunit" Version="2.3.0-beta3-build3705" />
+    <PackageReference Include="xunit" Version="2.3.0-beta4-build3742" />
+    <PackageReference Include="xunit.core" Version="2.3.0-beta4-build3742" />
+    <PackageReference Include="xunit.extensibility.execution" Version="2.3.0-beta4-build3742" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.0-beta4-build3742" />
+    <DotNetCliToolReference Include="dotnet-xunit" Version="2.3.0-beta4-build3742" />
   </ItemGroup>
 
   <ItemGroup>