Merge branch 'stable-5.9' into master

* stable-5.9:
  Prepare 5.9.0-SNAPSHOT builds
  EGit Mylyn Github Connector v5.9.0.202008260805-m3

Change-Id: I8b62903316c5fb3d6a6d18ff65530e06ad83b2a3
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>