Remove InvalidNullError#value as it is always nil

[ravangen]

Resolves #5243

InvalidNullError#value is always set to nil, it won't be a GraphQL::ExecutionError as the docs suggests.

graphql-ruby/lib/graphql/execution/interpreter/runtime.rb

Lines 469 to 476 in c2dedb0

	case value
	when nil
	if is_non_null
	set_result(selection_result, result_name, nil, false, is_non_null) do
	# When this comes from a list item, use the parent object:
	parent_type = selection_result.is_a?(GraphQLResultArray) ? selection_result.graphql_parent.graphql_result_type : selection_result.graphql_result_type
	# This block is called if `result_name` is not dead. (Maybe a previous invalid nil caused it be marked dead.)
	err = parent_type::InvalidNullError.new(parent_type, field, value)

[rmosolgo]

Derp, sorry I missed this when rounding up to release 2.4.11 😖 Now it has conflicts...

[ravangen]

No worries, I've resolved the conflicts

[rmosolgo]

Thanks!