Update dependency org.testcontainers:testcontainers to v2.0.3

Author: xdev-renovate

mailpit-java-client/pom.xml

@@ -144,7 +144,7 @@
 		<dependency>
 			<groupId>org.testcontainers</groupId>
 			<artifactId>testcontainers</artifactId>
-			<version>2.0.2</version>
+			<version>2.0.3</version>
 			<scope>test</scope>
 		</dependency>