Fixes in the GraphQL input types

In the latest releases, the GraphQL schema generation was improved by adding GraphQLNonNull to elements of arrays.

However, this caused arrays in input types to result in JSONObject instead of the specific type. (e9906b4)

What happened in the last release

Here's what happened

It also broke PR #890 which also fixes some JSONObject types, returning specific types instead.

[Booster]  Error: The type of UpsertDossierInput.parties must be Input Type but got: [DossierParty!].

With this release the input types are improved again, so they behave as expected: