fix typo

Author: georgeboot

src/SubscriptionRepository.php

@@ -47,7 +47,7 @@ public function clearConnection(string $connectionId): void
             'IndexName' => 'lookup-by-connection',
             'KeyConditionExpression' => 'connectionId = :connectionId',
             'ExpressionAttributeValues' => [
-                ':connectionI' => ['S' => $connectionId],
+                ':connectionId' => ['S' => $connectionId],
             ],
         ]);