Sandbox uses old doctrine/mongodb Connection class

[alexandre-abrioux]

Bug Report

Q	A
BC Break	no
Version	2.1.2

Summary

Hi! While setting-up an environment to work on #2238 I found out that the sandbox's config.php uses the old Doctrine\MongoDB\Connection class from the archived https://github.com/doctrine/mongodb driver repository (see below). I will send a PR that should fix it.

mongodb-odm/tools/sandbox/config.php

Line 21 in 5bc6803

$connection = new Connection();