Update testcontainers version to 1.21.4

Author: vietj

pom.xml

@@ -130,7 +130,7 @@
       <groupId>org.testcontainers</groupId>
       <artifactId>testcontainers</artifactId>
       <scope>test</scope>
-      <version>1.20.1</version>
+      <version>1.21.4</version>
     </dependency>
   </dependencies>
 
@@ -183,4 +183,4 @@
     </license>
   </licenses>
 
-</project>
+</project>