test: refine CASSANDRA_HOST name

lib-ee/emqx_ee_connector/test/emqx_ee_connector_cassa_SUITE.erl

@@ -26,7 +26,7 @@
 
 %% Cassandra server defined at `.ci/docker-compose-file/docker-compose-cassandra-tcp.yaml`
 %% You can change it to `127.0.0.1`, if you run this SUITE locally
--define(CASSANDRA_HOST, "cassa_tcp").
+-define(CASSANDRA_HOST, "cassandra").
 -define(CASSANDRA_RESOURCE_MOD, emqx_ee_connector_cassa).
 
 %% This test SUITE requires a running cassandra instance. If you don't want to