Bump Verify.Nunit from 26.4.0 to 26.4.4 in /src

Bumps [Verify.Nunit](https://github.com/VerifyTests/Verify) from 26.4.0 to 26.4.4.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@26.4.0...26.4.4)

---
updated-dependencies:
- dependency-name: Verify.Nunit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/Directory.Packages.props

@@ -12,6 +12,6 @@
     <PackageVersion Include="Polyfill" Version="6.3.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.135" />
     <PackageVersion Include="Verify" Version="26.4.4" />
-    <PackageVersion Include="Verify.Nunit" Version="26.4.0" />
+    <PackageVersion Include="Verify.Nunit" Version="26.4.4" />
   </ItemGroup>
 </Project>