Fixed the build issue #67

Author: Arash-Sabet

src/Xunit.Microsoft.DependencyInjection.csproj

@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="3.1.16" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="3.1.18" />
     <PackageReference Include="Microsoft.Extensions.Logging" Version="3.1.18" />
     <PackageReference Include="xunit.abstractions" Version="2.0.3" />
     <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="3.1.18" />