Fixes #1078: update: newtonsoft.json package reference version

[cutecycle]

We are excited to review your PR.

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• [x] There's a descriptive title that will make sense to other developers some time from now.
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Changes

Fixes #1078

• Update csproj to the latest Newtonsoft.Json.

[cutecycle]

I'm not sure how to request review from a PR that started as a draft... @Niharikadutta ?

[Niharikadutta]

@suhsteve can you also review please?

[cutecycle]

linking description since I don't have issue link permission: https://github.com/dotnet/spark/issues/1078

[AFFogarty]

LGTM, thanks @cutecycle !