refs #3430231: update unittests for drupal 11. Bump core version to 11. Remove...

Pierre Paul Lefebvrerequested to merge
issue/entity_reference_validators-3430231:entity_reference_validators-3430231 into 2.x

refs #3430231: update unittests for drupal 11. Bump core version to 11. Remove support for D8 and D9.

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