Bump NuGet.ProjectModel from 6.11.1 to 6.12.1 in /src (#2655)

Bumps [NuGet.ProjectModel](https://github.com/NuGet/NuGet.Client) from 6.11.1 to 6.12.1.
- [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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/GUI/EFCorePowerTools/EFCorePowerTools.csproj

@@ -610,7 +610,7 @@
     <PackageReference Include="MvvmLightLibs">
       <Version>5.4.1.1</Version>
     </PackageReference>
-    <PackageReference Include="NuGet.ProjectModel" Version="6.11.1" />
+    <PackageReference Include="NuGet.ProjectModel" Version="6.12.1" />
     <PackageReference Include="JetBrains.Annotations" Version="2024.2.0" />
   </ItemGroup>
   <Import Project="..\Shared\Shared.projitems" Label="Shared" />