chore: bump minimum version requirements

[adevade]

Description

Dropped support for PHP 7.x everywhere, since PHP 7.4 reached EOL a couple of days ago.

PHP 8.2 will release later this month, and I'll submit a separate PR to include that in CI scripts once it's out.

Checklist

• Read the contributing guidelines.
• Each commit follows the Conventional Commit spec format.
• Update the readme.
• All existing unit tests are still passing. (Tested locally on PHP 8.1)

[commit-lint]

Chore

• bump minimum php version for installation (730326c)
• define a minimum version for phpunit (a48e55c)
• update dependencies in composer.lock file (c46634e)

Continuous Integration

• update php versions to run circleci on (7c84820)
• add php 8.2 to test matrix (39e2fd8)

Documentation

• update php versions listed in readme header (09a2dc2)
• mention php 8.2 in the readme (5082ae7)

Contributors

adevade

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[luqven]

Fixed merge conflicts and waiting for CI to do its thing.