4.21 update of org.eclipse.ui.externaltools For https://git.eclipse.org/r/c/platform/eclipse.platform.debug/+/180767 Change-Id: Ica937a1ea6c9d9b6fa4c148c993eadcb91170baa Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com> Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.debug/+/181853 Tested-by: Platform Bot <platform-bot@eclipse.org>