Version bumps for 4.21

Needed by
https://git.eclipse.org/r/c/platform/eclipse.platform.ua/+/173448

Change-Id: I2b4b2713f9552f73c20bafd8341f615b94a3cad6
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.ua/+/183212
Tested-by: Platform Bot <platform-bot@eclipse.org>
2 files changed