Bump Verify.NUnit and Verify in /src (#777)

Bumps [Verify.NUnit](https://github.com/VerifyTests/Verify) and [Verify](https://github.com/VerifyTests/Verify). These dependencies needed to be updated together.

Updates `Verify.NUnit` from 27.0.0-beta.5 to 27.0.0-beta.6
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](https://github.com/VerifyTests/Verify/commits)

Updates `Verify` from 27.0.0-beta.5 to 27.0.0-beta.6
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](https://github.com/VerifyTests/Verify/commits)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -20,9 +20,9 @@
     <PackageVersion Include="Polyfill" Version="6.14.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.139" />
     <PackageVersion Include="System.Data.SqlClient" Version="4.8.6" />
-    <PackageVersion Include="Verify" Version="27.0.0-beta.5" />
+    <PackageVersion Include="Verify" Version="27.0.0-beta.6" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.0" />
-    <PackageVersion Include="Verify.NUnit" Version="27.0.0-beta.5" />
+    <PackageVersion Include="Verify.NUnit" Version="27.0.0-beta.6" />
     <PackageVersion Include="Verify.SqlServer" Version="10.0.0" />
     <!-- explicit to avoid CVE -->
     <PackageVersion Include="System.Text.Json" Version="8.0.4" />