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We need to upgrade the maven release and -nexus-staging plugins, as the current versions are outdated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