fix: update remaining `GraphQLNonNull<GraphQLType>` codepoints to (#3622)
fix: update remaining `GraphQLNonNull<GraphQLType>` codepoints to (#3622)

`GraphQLNonNull<GraphQLNullableType>`

This is related to #3597, in the sense that #3597 made the
`GraphQLNonNull<GraphQL*Type>` => `GraphQLNonNull<GraphQLNullable*Type>`
change in other code points related to the `isNonNullType` function, but
not within `GraphQLWrappingType` or assertNonNullType.

This PR was prompted by the uncovering of a bug by a different PR, see:
https://github.com/graphql/graphql-js/pull/3617#discussion_r885544662
graphql/graphql-js,graphql/graphql-js,graphql/graphql-js