Replace docker tag

Author: zguesmi

testchains/nethermind/docker-compose.yml

@@ -7,7 +7,7 @@ volumes:
 
 services:
   poco-chain:
-    image: nexus.intra.iex.ec/poco-chain:native-v5.4.0-5s
+    image: nexus.intra.iex.ec/poco-chain:<tag>
     container_name: poco-chain
     environment:
       # Netstats