Upgrade Maven Release Plugin => 3.0.1

[rsoika]

We need to upgrade the maven release and -nexus-staging plugins, as the current versions are outdated

• maven-release-plugin 2.5.3 ====> 3.0.1
• nexus-staging-maven-plugin 1.6.8 ====> 1.6.13

			<!-- release management -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-release-plugin</artifactId>
				<version>3.0.1</version>
				<configuration>
					<autoVersionSubmodules>true</autoVersionSubmodules>
					<useReleaseProfile>false</useReleaseProfile>
					<releaseProfiles>release</releaseProfiles>
					<goals>deploy</goals>
				</configuration>
			</plugin>
			<!-- release to Maven central -->
			<plugin>
				<groupId>org.sonatype.plugins</groupId>
				<artifactId>nexus-staging-maven-plugin</artifactId>
				<version>1.6.13</version>
				<extensions>true</extensions>
				<configuration>
					<serverId>ossrh</serverId>
					<nexusUrl>https://oss.sonatype.org/</nexusUrl>
					<autoReleaseAfterClose>true</autoReleaseAfterClose>
					<stagingProgressTimeoutMinutes>15</stagingProgressTimeoutMinutes>
				</configuration>
			</plugin>