Upgrade version for org.sonatype.m2e to 0.16

Plugin JBoss Maven Integration (org.jboss.tools.maven) has a dependency on plugin Maven SCM Handler for EGit (org.sonatype.m2e).

This plugin has dependency on EGit 5.x, but Eclipse 2021-12 comes with EGit 6.x, what breaks installation.

So, it's needed to upgrade reference for Maven SCM Handler for EGit plugin to 0.16.

References:

• https://github.com/tesla/m2eclipse-egit
• https://github.com/tesla/m2eclipse-egit/issues/19
• https://github.com/tesla/m2eclipse-egit/pull/20