chore(deps): bump NuGet.Protocol and Newtonsoft.Json

Bumps [NuGet.Protocol](https://github.com/NuGet/NuGet.Client) and [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json). These dependencies needed to be updated together.

Updates `NuGet.Protocol` from 6.0.5 to 6.9.1
- [Release notes](https://github.com/NuGet/NuGet.Client/releases)
- [Commits](https://github.com/NuGet/NuGet.Client/commits)

Updates `Newtonsoft.Json` from 13.0.2 to 13.0.3
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@13.0.2...13.0.3)

---
updated-dependencies:
- dependency-name: NuGet.Protocol
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: Newtonsoft.Json
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/NvGet/NvGet.csproj

@@ -20,7 +20,7 @@
 	<ItemGroup>
 		<PackageReference Include="System.Security.Cryptography.ProtectedData" Version="5.0.0" />
 		<PackageReference Include="Uno.Core" Version="2.0.0" />
-		<PackageReference Include="NuGet.Protocol" Version="6.0.5" />
+		<PackageReference Include="NuGet.Protocol" Version="6.9.1" />
 		<PackageReference Include="System.ValueTuple" Version="4.5.0" />
 	</ItemGroup>