test(qe): exclude json nested shorthand in MySQL 5.6 (#4438)

query-engine/connector-test-kit-rs/query-engine-tests/tests/queries/filters/json.rs

@@ -209,7 +209,7 @@ mod json {
 
     // The external runner for driver adapters, in spite of the protocol being used in the test matrix
     // uses the JSON representation of queries, so this test should not apply to driver adapters (exclude(JS))
-    #[connector_test(schema(json_opt), exclude(JS))]
+    #[connector_test(schema(json_opt), exclude(JS, MySQL(5.6)))]
     async fn nested_not_shorthand(runner: Runner) -> TestResult<()> {
         // Those tests pass with the JSON protocol because the entire object is parsed as JSON.
         // They remain useful to ensure we don't ever allow a full JSON filter input object type at the schema level.