Bump Verify.XunitV3 from 31.13.2 to 31.15.0 (#322)

Updated [Verify.XunitV3](https://github.com/VerifyTests/Verify) from
31.13.2 to 31.15.0.

<details>
<summary>Release notes</summary>

_Sourced from [Verify.XunitV3's
releases](https://github.com/VerifyTests/Verify/releases)._

## 31.14.0

- [x] [#​1700](VerifyTests/Verify#1700)
[TUnit] infrastructure fixtures appear in verified filenames / add
VerifierSettings.IgnoreParameters<T>
- [x] [#​1701](VerifyTests/Verify#1701) Support
global IgnoreParameters setting
- [x] [#​1702](VerifyTests/Verify#1702) add
IgnoreClassArguments

## 31.13.4

- [x] [#​1695](VerifyTests/Verify#1695) Bump
TUnit packages to 1.19.74
- [x] [#​1696](VerifyTests/Verify#1696)
DiffEngine 19.1.1

## 31.13.3

- [x] [#​1694](VerifyTests/Verify#1694)
DiffEngine 19.1.0

Commits viewable in [compare
view](https://github.com/VerifyTests/Verify/commits).
</details>

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Directory.Packages.props

@@ -19,7 +19,7 @@
     <PackageVersion Include="System.Security.Cryptography.X509Certificates" Version="4.3.2" />
     <PackageVersion Include="PolyKit.Embedded" Version="3.0.9" />
     <PackageVersion Include="Verify.SourceGenerators" Version="2.2.0" />
-    <PackageVersion Include="Verify.XunitV3" Version="31.13.2" />
+    <PackageVersion Include="Verify.XunitV3" Version="31.15.0" />
     <PackageVersion Include="xunit.v3" Version="3.2.2" />
   </ItemGroup>
 </Project>