fix(sharing): Don't change the type of the controller argument

[EA] New value type (\DateTime) is not matching the resolved parameter type and might introduce types-related false-positives.

Signed-off-by: Joas Schilling <coding@schilljs.com>

apps/files_sharing/lib/Controller/ShareAPIController.php

@@ -649,8 +649,8 @@ public function createShare(
 		//Expire date
 		if ($expireDate !== '') {
 			try {
-				$expireDate = $this->parseDate($expireDate);
-				$share->setExpirationDate($expireDate);
+				$expireDateTime = $this->parseDate($expireDate);
+				$share->setExpirationDate($expireDateTime);
 			} catch (\Exception $e) {
 				throw new OCSNotFoundException($this->l->t('Invalid date, date format must be YYYY-MM-DD'));
 			}