Bump testcontainers version to 1.21.4

Author: yuxiqian

pom.xml

@@ -73,7 +73,7 @@ limitations under the License.
         <debezium.version>1.9.8.Final</debezium.version>
         <tikv.version>3.2.0</tikv.version>
         <geometry.version>2.2.0</geometry.version>
-        <testcontainers.version>1.18.3</testcontainers.version>
+        <testcontainers.version>1.21.4</testcontainers.version>
         <hamcrest.version>1.3</hamcrest.version>
         <version.awaitility>4.2.0</version.awaitility>
         <slf4j.version>1.7.36</slf4j.version>