Bump Verify.Xunit from 29.3.1 to 29.4.0 in the verify group

Bumps the verify group with 1 update: [Verify.Xunit](https://github.com/VerifyTests/Verify).


Updates `Verify.Xunit` from 29.3.1 to 29.4.0
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@29.3.1...29.4.0)

---
updated-dependencies:
- dependency-name: Verify.Xunit
  dependency-version: 29.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: verify
...

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

Author: dependabot[bot]

src/Directory.Packages.props

@@ -14,7 +14,7 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
     <PackageVersion Include="Verify.SourceGenerators" Version="2.5.0" />
-    <PackageVersion Include="Verify.Xunit" Version="29.3.1" />
+    <PackageVersion Include="Verify.Xunit" Version="29.4.0" />
     <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="xunit.analyzers" Version="1.21.0" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.0.2" />