Bug 574017  - Version bump up for 4.21

Change-Id: Id564bd0aabe68f40a97accd19b4d0d5ed58aa29c
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.debug/+/182685
Tested-by: JDT Bot <jdt-bot@eclipse.org>
Reviewed-by: Sarika Sinha <sarika.sinha@in.ibm.com>
2 files changed