chore(deps): bump xunit from 2.5.1 to 2.5.3 in /test/UnitTest

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.1 to 2.5.3.
- [Commits](xunit/xunit@2.5.1...2.5.3)

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

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

test/UnitTest/Altinn.Authorization.ABAC.UnitTest.csproj

@@ -13,7 +13,7 @@
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="7.0.12" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
     <PackageReference Include="Moq" Version="4.20.69" />
-    <PackageReference Include="xunit" Version="2.5.2" />
+    <PackageReference Include="xunit" Version="2.5.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>