Laravel version update

Laravel version update

vendor/doctrine/dbal/lib/Doctrine/DBAL/TransactionIsolationLevel.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\DBAL;
+
+final class TransactionIsolationLevel
+{
+    /**
+     * Transaction isolation level READ UNCOMMITTED.
+     */
+    public const READ_UNCOMMITTED = 1;
+
+    /**
+     * Transaction isolation level READ COMMITTED.
+     */
+    public const READ_COMMITTED = 2;
+
+    /**
+     * Transaction isolation level REPEATABLE READ.
+     */
+    public const REPEATABLE_READ = 3;
+
+    /**
+     * Transaction isolation level SERIALIZABLE.
+     */
+    public const SERIALIZABLE = 4;
+
+    private function __construct()
+    {
+    }
+}