GH-1317 - Update to Testcontainers 1.21.3.

Author: odrotbohm

pom.xml

@@ -49,7 +49,7 @@
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 		<spring-boot.version>4.0.0-SNAPSHOT</spring-boot.version>
 		<spring-framework.version>7.0.0-SNAPSHOT</spring-framework.version> <!-- For Javadoc links only -->
-		<testcontainers.version>1.21.1</testcontainers.version>
+		<testcontainers.version>1.21.3</testcontainers.version>
 		<structurizr.version>4.1.0</structurizr.version>
 		<micrometer-tracing.version>1.5.1</micrometer-tracing.version>