Update Schema Registry CODEOWNERs (Azure#16987)

Removing myself as a Schema Registry CODEOWNER.

Author: alzimmermsft

.github/CODEOWNERS

@@ -505,7 +505,7 @@ sdk/trafficmanager/Microsoft.Azure.Management.TrafficManager/            @tmsupp
 /sdk/servicefabric/Microsoft.Azure.Management.ServiceFabric/           @QingChenmsft @vaishnavk @juhacket
 
 # ServiceLabel: %Schema Registry %Service Attention
-/sdk/schemaregistry/            @arerlend @alzimmermsft
+/sdk/schemaregistry/            @arerlend
 
 # ServiceLabel: %SignalR %Service Attention
 /sdk/signalr/Microsoft.Azure.Management.SignalR/            @sffamily @chenkennt