Removes outdated code from perform_request_spec

Author: picandocodigo

elasticsearch-api/spec/unit/perform_request_spec.rb

@@ -99,8 +99,6 @@ def files
       params.merge(part.to_sym => 'testing')
     end
 
-    required_params.merge!(body: {}) if ['inference.put', 'inference.update', 'inference.chat_completion_unified'].include? spec.endpoint_name
-
     let(:client_double) do
       Class.new { include Elasticsearch::API }.new.tap do |client|
         expect(client).to receive(:perform_request) do |_, _, _, _, _, request_params|