define maven plugin versions as properties

pom.xml

@@ -29,7 +29,15 @@
 		<hamcrest.version>3.0</hamcrest.version>
 
 		<!-- mvn plugins -->
+		<mvn-compiler.version>3.13.0</mvn-compiler.version>
+		<mvn-surefire.version>3.5.0</mvn-surefire.version>
+		<mvn-jar.version>3.4.2</mvn-jar.version>
+		<mvn-source.version>3.3.1</mvn-source.version>
+		<mvn-javadoc.version>3.10.0</mvn-javadoc.version>
+		<mvn-gpg.version>3.2.7</mvn-gpg.version>
 		<dependency-check.version>10.0.4</dependency-check.version>
+		<jacoco.version>0.8.12</jacoco.version>
+		<nexus-staging.version>1.7.0</nexus-staging.version>
 	</properties>
 
 	<licenses>
@@ -123,20 +131,20 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.13.0</version>
+				<version>${mvn-compiler.version}</version>
 				<configuration>
 					<release>11</release>
 					<showWarnings>true</showWarnings>
 				</configuration>
 			</plugin>
 			<plugin>
 				<artifactId>maven-surefire-plugin</artifactId>
-				<version>3.5.0</version>
+				<version>${mvn-surefire.version}</version>
 			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-jar-plugin</artifactId>
-				<version>3.4.2</version>
+				<version>${mvn-jar.version}</version>
 				<configuration>
 					<archive>
 						<manifestEntries>
@@ -147,7 +155,7 @@
 			</plugin>
 			<plugin>
 				<artifactId>maven-source-plugin</artifactId>
-				<version>3.3.1</version>
+				<version>${mvn-source.version}</version>
 				<executions>
 					<execution>
 						<id>attach-sources</id>
@@ -159,7 +167,7 @@
 			</plugin>
 			<plugin>
 				<artifactId>maven-javadoc-plugin</artifactId>
-				<version>3.10.0</version>
+				<version>${mvn-javadoc.version}</version>
 				<executions>
 					<execution>
 						<id>attach-javadocs</id>
@@ -208,7 +216,7 @@
 					<plugin>
 						<groupId>org.jacoco</groupId>
 						<artifactId>jacoco-maven-plugin</artifactId>
-						<version>0.8.12</version>
+						<version>${jacoco.version}</version>
 						<executions>
 							<execution>
 								<id>prepare-agent</id>
@@ -231,7 +239,7 @@
 				<plugins>
 					<plugin>
 						<artifactId>maven-gpg-plugin</artifactId>
-						<version>3.2.7</version>
+						<version>${mvn-gpg.version}</version>
 						<executions>
 							<execution>
 								<id>sign-artifacts</id>
@@ -265,7 +273,7 @@
 					<plugin>
 						<groupId>org.sonatype.plugins</groupId>
 						<artifactId>nexus-staging-maven-plugin</artifactId>
-						<version>1.7.0</version>
+						<version>${nexus-staging.version}</version>
 						<extensions>true</extensions>
 						<configuration>
 							<serverId>ossrh</serverId>