Merge branch 'stable-5.12'

* stable-5.12:
  Prepare 5.12.0-SNAPSHOT builds
  EGit Mylyn Github Connector v5.12.0.202105051250-m2

Change-Id: If20c25c626a891d337c94d7b9499f4684e901d5d
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>