Bump xunit dependencies to latest

OhmGraphite.Test/OhmGraphite.Test.csproj

@@ -8,9 +8,9 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
     <PackageReference Include="Testcontainers" Version="3.5.0" />
-    <PackageReference Include="xunit" Version="2.5.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.1"/>
-    <PackageReference Include="xunit.runner.console" Version="2.5.1"/>
+    <PackageReference Include="xunit" Version="2.6.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3"/>
+    <PackageReference Include="xunit.runner.console" Version="2.6.0"/>
   </ItemGroup>
 
   <ItemGroup>