Update dependency Verify.Xunit to v20.4.0 (#461)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [Verify.Xunit](https://togithub.com/VerifyTests/Verify) | nuget |
minor | `20.3.2` -> `20.4.0` |

---

### Release Notes

<details>
<summary>VerifyTests/Verify</summary>

###
[`v20.4.0`](https://togithub.com/VerifyTests/Verify/releases/tag/20.4.0)

[Compare
Source](https://togithub.com/VerifyTests/Verify/compare/20.3.2...20.4.0)

As part of this release we had [26
commits](https://togithub.com/VerifyTests/Verify/compare/20.3.2...20.4.0)
which resulted in [2
issues](https://togithub.com/VerifyTests/Verify/milestone/268?closed=1)
being closed.

**Bug**

- [**#&#8203;920**](https://togithub.com/VerifyTests/Verify/pull/920)
Remove parameter hashing from unsupported tfm

**Feature**

- [**#&#8203;922**](https://togithub.com/VerifyTests/Verify/pull/922)
update to expecto 10

</details>

---

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Directory.Packages.props

@@ -33,7 +33,7 @@
     <PackageVersion Include="SonarAnalyzer.CSharp" Version="9.3.0.71466" />
     <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.435" />
     <PackageVersion Include="Testcontainers.MsSql" Version="3.2.0" />
-    <PackageVersion Include="Verify.Xunit" Version="20.3.2" />
+    <PackageVersion Include="Verify.Xunit" Version="20.4.0" />
     <PackageVersion Include="xunit" Version="2.4.2" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.4.5" />
   </ItemGroup>