Update dependency org.apache.maven.plugins:maven-checkstyle-plugin to v3.4.0

Author: xdev-renovate

pom.xml

@@ -36,7 +36,7 @@
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-checkstyle-plugin</artifactId>
-						<version>3.3.1</version>
+						<version>3.4.0</version>
 						<configuration>
 							<skip>true</skip>
 						</configuration>

vaadin-chip-combobox-demo/pom.xml

@@ -184,7 +184,7 @@
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-checkstyle-plugin</artifactId>
-						<version>3.3.1</version>
+						<version>3.4.0</version>
 						<dependencies>
 							<dependency>
 								<groupId>com.puppycrawl.tools</groupId>

vaadin-chip-combobox/pom.xml

@@ -293,7 +293,7 @@
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-checkstyle-plugin</artifactId>
-						<version>3.3.1</version>
+						<version>3.4.0</version>
 						<dependencies>
 							<dependency>
 								<groupId>com.puppycrawl.tools</groupId>