GH-123 - Update build plugins.

Author: odrotbohm

pom.xml

@@ -99,7 +99,7 @@
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-javadoc-plugin</artifactId>
-						<version>3.11.2</version>
+						<version>3.12.0</version>
 						<executions>
 							<execution>
 								<id>create-javadoc-jar</id>
@@ -167,7 +167,7 @@
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-gpg-plugin</artifactId>
-						<version>3.2.7</version>
+						<version>3.2.8</version>
 						<executions>
 							<execution>
 								<id>sign-artifacts</id>
@@ -325,7 +325,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.13.0</version>
+				<version>3.14.1</version>
 				<configuration>
 					<release>${source.level}</release>
 				</configuration>
@@ -334,13 +334,13 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-surefire-plugin</artifactId>
-				<version>3.5.2</version>
+				<version>3.5.4</version>
 			</plugin>
 
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-source-plugin</artifactId>
-				<version>3.2.1</version>
+				<version>3.3.1</version>
 				<executions>
 					<execution>
 						<id>attach-sources</id>
@@ -369,7 +369,7 @@
 			<plugin>
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>flatten-maven-plugin</artifactId>
-				<version>1.6.0</version>
+				<version>1.7.3</version>
 				<executions>
 					<execution>
 						<id>flatten</id>