Bump the xunit group with 1 update (dotnet#10816)

Bumps Verify.Xunit from 30.13.0 to 30.15.0

---
updated-dependencies:
- dependency-name: Verify.Xunit
  dependency-version: 30.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: xunit
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

test/Directory.Packages.props

@@ -6,7 +6,7 @@
     <PackageVersion Include="AwesomeAssertions" Version="9.0.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
-    <PackageVersion Include="Verify.Xunit" Version="30.13.0" />
+    <PackageVersion Include="Verify.Xunit" Version="30.15.0" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.4" />
     <PackageVersion Include="xunit" Version="2.9.3" />
   </ItemGroup>