[releng] Update Xtext version to 2.21.0

eclipse / xtext-lib

Eclipse Xtext™ Libraries

https://www.eclipse.org/Xtext/

Eclipse Public License 2.0

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Closed genie-xtext closed 4 years ago

genie-xtext commented 4 years ago

This change was brought to you by your friendly Xtext Genie.

kthoms commented 4 years ago

Just an experiment