Update testcontainers-java monorepo to v1.21.4

Author: renovate[bot]

pom.xml

@@ -18,7 +18,7 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
         <maven-test-plugins.version>3.5.4</maven-test-plugins.version>
-        <org.testcontainers.version>1.21.3</org.testcontainers.version>
+        <org.testcontainers.version>1.21.4</org.testcontainers.version>
     </properties>
 
     <distributionManagement>