Update dependency org.openapitools:openapi-generator-maven-plugin to v7.21.0

Author: xdev-renovate

mailpit-java-client/pom.xml

@@ -390,7 +390,7 @@
 					<plugin>
 						<groupId>org.openapitools</groupId>
 						<artifactId>openapi-generator-maven-plugin</artifactId>
-						<version>7.20.0</version>
+						<version>7.21.0</version>
 						<executions>
 							<execution>
 								<goals>