test(oracle): attempt to fix flaky test
https://github.com/emqx/emqx/actions/runs/5126014459/jobs/9220155908#step:7:754
```
=CRITICAL REPORT==== 30-May-2023::20:50:26.267103 ===
Run stage failed: error:{assertMatch,
[{module,emqx_bridge_oracle_SUITE},
{line,394},
{expression,
"emqx_resource : simple_sync_query ( ResourceId , { query , \"SELECT COUNT(*) FROM mqtt_test\" } )"},
{pattern,
"{ ok , [ { result_set , _ , _ , [ [ { 3 } ] ] } ] }"},
{value,
{ok,[{result_set,[<<"COUNT(*)">>],[],[[{0}]]}]}}]}
Stacktrace: [{emqx_bridge_oracle_SUITE,'-t_batch_sync_query/1-fun-5-',1,
[{file,
"/emqx/apps/emqx_bridge_oracle/test/emqx_bridge_oracle_SUITE.erl"},
{line,394}]},
{emqx_bridge_oracle_SUITE,'-t_batch_sync_query/1-fun-6-',5,
[{file,
"/emqx/apps/emqx_bridge_oracle/test/emqx_bridge_oracle_SUITE.erl"},
{line,390}]},
{emqx_bridge_oracle_SUITE,t_batch_sync_query,1,
[{file,
"/emqx/apps/emqx_bridge_oracle/test/emqx_bridge_oracle_SUITE.erl"},
{line,364}]}]
```
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