emqx4.3/changes/ee/fix-13896.en.md

Upgrade pulsar client from 0.8.3 to 0.8.4 (see pulsar#61.

Piror this fix, if the producer client experiences a 'socket error' (but not a normal 'socket close'), it may continue sending data to a clsoed socket without any error handling. From EMQX dashboard, user may observe that the 'totoal' counter keep increasing, but not the other counters: 'success', 'failed' and 'dropped'.