Remove MySQL 8.0.30 from old scenario (needs JDBC URL fixes, covered by mysql-9.x-scenario from 8.4.0)

Author: wu-sheng

test/plugin/scenarios/mysql-scenario/support-version.list

@@ -14,9 +14,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# mysql:mysql-connector-java artifact ends at 8.0.33
-# For com.mysql:mysql-connector-j (8.0.31+, 9.x), see mysql-9.x-scenario
-8.0.30
+# 8.0.30+ requires allowPublicKeyRetrieval=true and serverTimezone=UTC
+# Those versions are tested in mysql-9.x-scenario with the fixed JDBC URL
 8.0.19
 8.0.15
 6.0.6