build(deps): bump Verify.Xunit from 14.14.1 to 15.0.0 in /src (#3147)

Bumps [Verify.Xunit](https://github.com/VerifyTests/Verify) from 14.14.1 to 15.0.0.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](https://github.com/VerifyTests/Verify/compare/14.14.1...15.0.0)

---
updated-dependencies:
- dependency-name: Verify.Xunit
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

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

src/Directory.build.props

@@ -52,7 +52,7 @@
     <PackageReference Include="Microsoft.Reactive.Testing" Version="5.0.0" />
     <PackageReference Include="PublicApiGenerator" Version="10.2.0" />
     <PackageReference Include="coverlet.msbuild" Version="3.1.0" PrivateAssets="All" />
-    <PackageReference Include="Verify.Xunit" Version="14.14.1" />
+    <PackageReference Include="Verify.Xunit" Version="15.0.0" />
   </ItemGroup>
   
   <ItemGroup Condition="'$(IsTestProject)' != 'true'">