Bump xunit

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.3 to 2.6.0.
- [Commits](xunit/xunit@2.5.3...2.6.0)

---
updated-dependencies:
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

framework/libraries/migrate-library-csproj-keep-existing/tests/Car.Tests.Net45/Car.Tests.Net45.csproj

@@ -20,7 +20,7 @@
     <PackageReference Include="System.Data.DataSetExtensions" Version="4.5.0" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="xunit" Version="2.5.3" />
+    <PackageReference Include="xunit" Version="2.6.0" />
     <PackageReference Include="xunit.abstractions" Version="2.0.3" />
     <PackageReference Include="xunit.analyzers" Version="1.4.0" />
     <PackageReference Include="xunit.assert" Version="2.6.0" />

framework/libraries/migrate-library-csproj-keep-existing/tests/Car.Tests.Net45/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="xunit" version="2.5.3" targetFramework="net452" />
+  <package id="xunit" version="2.6.0" targetFramework="net452" />
   <package id="xunit.abstractions" version="2.0.3" targetFramework="net452" />
   <package id="xunit.analyzers" version="1.4.0" targetFramework="net452" />
   <package id="xunit.assert" version="2.6.0" targetFramework="net452" />