test(cassandra): attempt to fix flaky test
```
=ERROR REPORT==== 29-May-2023::20:35:20.457796 ===
id: <<"bridge:cassandra:emqx_bridge_cassandra_SUITE">>
msg: unrecoverable_error
reason: {8704,<<"Expected 8 or 0 byte long for date (4)">>}
=CRITICAL REPORT==== 29-May-2023::20:35:20.458850 ===
"check stage" failed: error
{assertMatch,[{module,emqx_bridge_cassandra_SUITE},
{line,619},
{expression,"Trace"},
{pattern,"[ # { result := { ok , _Pid } } ]"},
{value,[]}]}
Stacktrace: [{emqx_bridge_cassandra_SUITE,'-t_missing_data/1-fun-3-',1,
[{file,
"/emqx/apps/emqx_bridge_cassandra/test/emqx_bridge_cassandra_SUITE.erl"},
{line,619}]},
{emqx_bridge_cassandra_SUITE,t_missing_data,1,
[{file,
"/emqx/apps/emqx_bridge_cassandra/test/emqx_bridge_cassandra_SUITE.erl"},
{line,607}]}]
=CRITICAL REPORT==== 29-May-2023::20:35:20.471872 ===
Check stage failed. Trace dump: "/emqx/_build/test/logs/ct_run.test@127.0.0.1.2023-05-29_20.34.32/snabbkaffe/1685392520460040358.log"
%%% emqx_bridge_cassandra_SUITE ==> tcp.sync.with_batch.t_missing_data: FAILED
%%% emqx_bridge_cassandra_SUITE ==> {{panic,#{msg => "Unexpected result",result => {error,check_stage_failed}}},
[{emqx_bridge_cassandra_SUITE,t_missing_data,1,
[{file,"/emqx/apps/emqx_bridge_cassandra/test/emqx_bridge_cassandra_SUITE.erl"},
{line,624}]},
{test_server,ts_tc,3,[{file,"test_server.erl"},{line,1782}]},
{test_server,run_test_case_eval1,6,[{file,"test_server.erl"},{line,1291}]},
{test_server,run_test_case_eval,9,[{file,"test_server.erl"},{line,1223}]}]}
```
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