Revert "Upgrade testcontainers dependency to 1.16.2 (#591)"

Author: wuchong

pom.xml

@@ -70,7 +70,7 @@ under the License.
         <flink.version>1.13.1</flink.version>
         <debezium.version>1.5.4.Final</debezium.version>
         <geometry.version>2.2.0</geometry.version>
-        <testcontainers.version>1.16.2</testcontainers.version>
+        <testcontainers.version>1.15.3</testcontainers.version>
         <java.version>1.8</java.version>
         <scala.binary.version>2.11</scala.binary.version>
         <maven.compiler.source>${java.version}</maven.compiler.source>