update pulsar receiver/exporter CODEOWNERS (open-telemetry#24424)

Update pulsar receiver/exporter codeowner from @tjiuming to @dao-jun 

Fixes open-telemetry#23406

.github/CODEOWNERS

@@ -72,7 +72,7 @@ exporter/opencensusexporter/ @open-telemetry/collect
 exporter/parquetexporter/ @open-telemetry/collector-contrib-approvers @atoulme
 exporter/prometheusexporter/ @open-telemetry/collector-contrib-approvers @Aneurysm9
 exporter/prometheusremotewriteexporter/ @open-telemetry/collector-contrib-approvers @Aneurysm9 @rapphil
-exporter/pulsarexporter/ @open-telemetry/collector-contrib-approvers @dmitryax @tjiuming
+exporter/pulsarexporter/ @open-telemetry/collector-contrib-approvers @dmitryax @dao-jun
 exporter/sapmexporter/ @open-telemetry/collector-contrib-approvers @dmitryax @atoulme
 exporter/sentryexporter/ @open-telemetry/collector-contrib-approvers @AbhiPrasad
 exporter/signalfxexporter/ @open-telemetry/collector-contrib-approvers @dmitryax @crobert-1
@@ -222,7 +222,7 @@ receiver/podmanreceiver/ @open-telemetry/collect
 receiver/postgresqlreceiver/ @open-telemetry/collector-contrib-approvers @djaglowski
 receiver/prometheusexecreceiver/ @open-telemetry/collector-contrib-approvers @dmitryax
 receiver/prometheusreceiver/ @open-telemetry/collector-contrib-approvers @Aneurysm9 @dashpole
-receiver/pulsarreceiver/ @open-telemetry/collector-contrib-approvers @dmitryax @tjiuming
+receiver/pulsarreceiver/ @open-telemetry/collector-contrib-approvers @dmitryax @dao-jun
 receiver/purefareceiver/ @open-telemetry/collector-contrib-approvers @jpkrohling @dgoscn @chrroberts-pure
 receiver/purefbreceiver/ @open-telemetry/collector-contrib-approvers @jpkrohling @dgoscn @chrroberts-pure
 receiver/rabbitmqreceiver/ @open-telemetry/collector-contrib-approvers @djaglowski @cpheps