Update dependency NuGet.ProjectModel to v7

Author: renovate[bot]

Directory.Packages.props

@@ -36,7 +36,7 @@
         <PackageVersion Include="Nuke.Common" Version="9.0.4" />
         <PackageVersion Include="ReportGenerator" Version="5.5.0" />
         <PackageVersion Include="Rocket.Surgery.Nuke" Version="2.9.12" />
-        <PackageVersion Include="NuGet.ProjectModel" Version="6.14.0" />
+        <PackageVersion Include="NuGet.ProjectModel" Version="7.0.1" />
 
         <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.14.0" />
         <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.14.0" />