Bump Verify.XunitV3 from 28.7.0 to 28.8.1 in /src

Bumps [Verify.XunitV3](https://github.com/VerifyTests/Verify) from 28.7.0 to 28.8.1.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](https://github.com/VerifyTests/Verify/commits)

---
updated-dependencies:
- dependency-name: Verify.XunitV3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/Directory.Packages.props

@@ -22,7 +22,7 @@
     <PackageVersion Include="ProjectDefaults" Version="1.0.147" />
     <PackageVersion Include="System.Text.Encodings.Web" Version="9.0.0" />
     <PackageVersion Include="Verify.SqlServer" Version="10.1.0" />
-    <PackageVersion Include="Verify.XunitV3" Version="28.7.0" />
+    <PackageVersion Include="Verify.XunitV3" Version="28.8.1" />
     <PackageVersion Include="xunit.v3" Version="1.0.0" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.0.0" />
   </ItemGroup>