Revert "fix: Fixed version of release plugin to the same used by sonatype parent project"

This reverts commit 5948b6e.

Author: sapessi

pom.xml

@@ -132,7 +132,6 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-release-plugin</artifactId>
-                    <version>2.1</version>
                     <configuration>
                         <preparationGoals>clean verify install</preparationGoals>
                         <pushChanges>false</pushChanges>