Explicitly add column name to SQLite query (#43832)

Fix for ErrorException: Undefined array key "size" while running artisan db:show on a SQLite database

src/Illuminate/Database/Console/DatabaseInspectionCommand.php

@@ -149,7 +149,7 @@ protected function getPostgresTableSize(ConnectionInterface $connection, string
      */
     protected function getSqliteTableSize(ConnectionInterface $connection, string $table)
     {
-        $result = $connection->selectOne('SELECT SUM(pgsize) FROM dbstat WHERE name=?', [
+        $result = $connection->selectOne('SELECT SUM(pgsize) AS size FROM dbstat WHERE name=?', [
             $table,
         ]);