Do not try to run session tests when we are in 3.4 fcv on 3.6 server (#2397)

Co-authored-by: Oleg Pudeyev <[email protected]>

Author: p-mongo

spec/mongo/collection/view/readable_spec.rb

@@ -678,6 +678,8 @@
     end
 
     context 'when session is given' do
+      min_server_fcv '3.6'
+
       let(:subscriber) { Mrss::EventSubscriber.new }
 
       before do