Update test libraries

Author: asherber

Xunit.Priority.Tests/Xunit.Priority.Tests.csproj

@@ -7,9 +7,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="xunit" Version="2.9.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.1" />
     <PackageReference Include="FluentAssertions" Version="5.8.0" />
   </ItemGroup>