Revert "Update CONTRACTS_VERSION to 2.9.0"

This reverts commit a8e00b8.

Author: alexcos20

start_ocean.sh

@@ -31,7 +31,7 @@ export TYPESENSE_VERSION=${TYPESENSE_VERSION:-0.25.1}
 export AQUARIUS_VERSION=${AQUARIUS_VERSION:-v5.1.5}
 export ELASTICSEARCH_VERSION=${ELASTICSEARCH_VERSION:-8.5.1}
 export NODE_VERSION=${NODE_VERSION:-main}
-export CONTRACTS_VERSION=${CONTRACTS_VERSION:-2.9.0}
+export CONTRACTS_VERSION=${CONTRACTS_VERSION:-2.8.0}
 
 
 export PROJECT_NAME="ocean"