Update maven-dependency-plugin to 3.8.1

Define the version in pluginManagement section of the parent so version
is centralized.

Author: akurtakov

m2e-parent/pom.xml

@@ -199,6 +199,11 @@
 						</dependency>
 					</dependencies>
 				</plugin>
+				<plugin>
+					<groupId>org.apache.maven.plugins</groupId>
+					<artifactId>maven-dependency-plugin</artifactId>
+					<version>3.8.1</version>
+				</plugin>
 			</plugins>
 		</pluginManagement>
 	</build>

org.eclipse.m2e.maven.runtime/pom.xml

@@ -235,7 +235,6 @@
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-dependency-plugin</artifactId>
-					<version>3.8.0</version>
 					<configuration>
 						<overWriteIfNewer>true</overWriteIfNewer>
 						<includeScope>runtime</includeScope> <!-- only include runtime and compile time dependencies, not test or provided! -->

org.eclipse.m2e.pde.connector.tests/projects/bnd/pom.xml

@@ -25,7 +25,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-dependency-plugin</artifactId>
-				<version>3.3.0</version>
+				<version>3.8.1</version>
 				<configuration>
 					<overWriteReleases>true</overWriteReleases>
 					<includeScope>runtime</includeScope> <!-- only include runtime and compile time dependencies, not test or provided! -->