Outdated version of psr/container in composer.json

[rikgirbes]

Description:
The composer.json file for the php-sdk currently uses psr/container version 1.0, while the latest version 2.0.2 is available. This causes dependency conflicts, particularly when working with PHP 8. (1 -> 2 was mostly a php 8 update)

Actions:

• Upgrade psr/container from version 1.0 to 2.0.2.
• Verify compatibility of the codebase with the updated version.

Impact:
Version 2.0.2 is optimized for PHP 8, introducing strict_types and type declarations for the get() and has() methods.