Bump NuGet.LibraryModel from 5.8.1 to 5.9.1 (#43)

Bumps [NuGet.LibraryModel](https://github.com/NuGet/NuGet.Client) from 5.8.1 to 5.9.1.
- [Release notes](https://github.com/NuGet/NuGet.Client/releases)
- [Commits](https://github.com/NuGet/NuGet.Client/commits)

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

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

src/ReactiveMarbles.NuGet.Helpers/ReactiveMarbles.NuGet.Helpers.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="NuGet.LibraryModel" Version="5.8.1" />
+		<PackageReference Include="NuGet.LibraryModel" Version="5.9.1" />
 		<PackageReference Include="NuGet.Protocol" Version="5.8.1" />
 	</ItemGroup>