Bump to PHP8.1

What's Changed

• Use Composer 2 by @Taluu in #21
• Fix passing composer_ignore_platform_reqs value by @simPod in #26
• Added abilty to provide SSH keys for loading private packages by @bravik in #30
• Wrong condition for ignore platform reqs by @reflexxion in #29
• allow to run it in a subdir by @szaimen in #36
• fix relative dir by @szaimen in #37
• Bump PHP to 8.1 by @wow-apps in #43

New Contributors

• @Taluu made their first contribution in #21
• @bravik made their first contribution in #30
• @reflexxion made their first contribution in #29
• @szaimen made their first contribution in #36
• @wow-apps made their first contribution in #43

Full Changelog: 1.1.2...2.0.0