Bump NuGet.ProjectModel from 6.6.1 to 6.7.0

Bumps [NuGet.ProjectModel](https://github.com/NuGet/NuGet.Client) from 6.6.1 to 6.7.0.
- [Release notes](https://github.com/NuGet/NuGet.Client/releases)
- [Commits](https://github.com/NuGet/NuGet.Client/commits)

---
updated-dependencies:
- dependency-name: NuGet.ProjectModel
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/Directory.Packages.props

@@ -3,7 +3,7 @@
     <PackageVersion Include="NuGetizer" Version="1.1.1" />
     <PackageVersion Include="Microsoft.Extensions.DependencyModel" Version="6.0.0" />
     <PackageVersion Include="Microsoft.Playwright" Version="1.27.1" />
-    <PackageVersion Include="NuGet.ProjectModel" Version="6.6.1" />
+    <PackageVersion Include="NuGet.ProjectModel" Version="6.7.0" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="1.1.1" />
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" />
     <PackageVersion Include="Devlooped.SponsorLink" Version="1.1.0" />