Updates to xunit 2.6.2 which fixes issue in 2.6.1 (#3003)

UnitTests/UnitTests.csproj

@@ -25,8 +25,8 @@
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     <PackageReference Include="System.Collections" Version="4.3.0" />
     <PackageReference Include="TestableIO.System.IO.Abstractions.TestingHelpers" Version="19.2.87" />
-    <PackageReference Include="xunit" Version="2.5.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3">
+    <PackageReference Include="xunit" Version="2.6.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.4">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
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