update checkstyle

checkstyle-ruleset.xml

@@ -3,7 +3,7 @@
 <module name="Checker">
 	<property name="severity" value="warning" />
 	<module name="TreeWalker">
-		<module name="FileContentsHolder" />
+		<!-- <module name="FileContentsHolder" /> -->
 		<module name="JavadocType">
 			<property name="allowUnknownTags" value="true" />
 		</module>
@@ -139,11 +139,13 @@
 	<module name="FileLength">
 		<property name="max" value="500" />
 	</module>
+	<!--
 	<module name="SuppressionCommentFilter">
 		<property name="offCommentFormat" value="CHECKSTYLE.OFF\: ([\w\|]+)" />
 		<property name="onCommentFormat" value="CHECKSTYLE.ON\: ([\w\|]+)" />
 		<property name="checkFormat" value="$1" />
 	</module>
+	-->
 	<module name="NewlineAtEndOfFile">
 		<property name="lineSeparator" value="lf" />
 	</module>

pom.xml

@@ -212,6 +212,13 @@
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-checkstyle-plugin</artifactId>
 					<version>3.0.0</version>
+					<dependencies>
+						<dependency>
+							<groupId>com.puppycrawl.tools</groupId>
+							<artifactId>checkstyle</artifactId>
+							<version>8.18</version>
+						</dependency>
+					</dependencies>
 				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
@@ -499,7 +506,6 @@
 								<detectLinks>true</detectLinks>
 								<fixClassComment>true</fixClassComment>
 								<fixTags>all</fixTags>
-								<javadocVersion>${project.build.sourceVersion}</javadocVersion>
 								<packagesheader>${project.artifactId}</packagesheader>
 								<tags>
 									<tag>