Update dependency com.puppycrawl.tools:checkstyle to v10.21.2

Author: xdev-renovate

testcontainers-advanced-imagebuilder-dummy-app/pom.xml

@@ -82,7 +82,7 @@
 							<dependency>
 								<groupId>com.puppycrawl.tools</groupId>
 								<artifactId>checkstyle</artifactId>
-								<version>10.20.1</version>
+								<version>10.21.2</version>
 							</dependency>
 						</dependencies>
 						<configuration>