trash_entity_is_deleted() is deprecated in trash:3.0.30 and is removed from trash:3.1.0 [#3619286]

Problem/Motivation

The following deprecation warning appears:

PHP Deprecated: trash_entity_is_deleted() is deprecated in trash:3.0.30 and is removed from trash:3.1.0. Use \Drupal\trash\Trash::entityIsDeleted() instead. See https://www.drupal.org/node/3609675 in /[..]/web/modules/contrib/trash/trash.module on line 45

Proposed resolution

Do what it says.

Issue fork content_lock-3619286

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3619286-trashentityisdeleted-is-deprecated changes, plain diff MR !126
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