Update aws/aws-sdk-php module

[ArnoVDC]

Problem

According to this post the aws/aws-sdk-php composer module <= 3.367 is no longer secure.

Currently Akeneo requires aws/aws-sdk-php 3.253.0 in composer.json, therefore we are unable to upgrade the module to a secure version.

Solution

Change composer requirements to aws/aws-sdk-php >=3.368.0

[mmetayer]

@ArnoVDC I'm currently working on it (see #20576 for instance), I'll get back to you when it's released