chore(deps): update dependency verify.xunit to v20.8.0 (#504)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [Verify.Xunit](https://togithub.com/VerifyTests/Verify) | nuget |
minor | `20.7.0` -> `20.8.0` |

---

### Release Notes

<details>
<summary>VerifyTests/Verify (Verify.Xunit)</summary>

###
[`v20.8.0`](https://togithub.com/VerifyTests/Verify/releases/tag/20.8.0)

[Compare
Source](https://togithub.com/VerifyTests/Verify/compare/20.7.0...20.8.0)

As part of this release we had [9
commits](https://togithub.com/VerifyTests/Verify/compare/20.7.0...20.8.0)
which resulted in [1
issue](https://togithub.com/VerifyTests/Verify/milestone/274?closed=1)
being closed.

**Feature**

- [**#&#8203;967**](https://togithub.com/VerifyTests/Verify/pull/967)
update EmptyFiles and DiffEngine

</details>

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Directory.Packages.props

@@ -32,7 +32,7 @@
     <PackageVersion Include="SonarAnalyzer.CSharp" Version="9.7.0.75501" />
     <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.507" />
     <PackageVersion Include="Testcontainers.MsSql" Version="3.4.0" />
-    <PackageVersion Include="Verify.Xunit" Version="20.7.0" />
+    <PackageVersion Include="Verify.Xunit" Version="20.8.0" />
     <PackageVersion Include="xunit" Version="2.5.0" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.0" />
   </ItemGroup>