update sdk for latest php(8.3) and phpunit(11) version

[hausmani2]

Update PHP and PHPUnit versions; fix deprecations and errors

• Upgraded PHP to 8.3
• Upgraded PHPUnit to 11
• Resolved deprecated functions and features in codebase
• Addressed compatibility issues with updated PHP and PHPUnit versions
• Updated dependencies and configuration files to match new versions"

[ygrigoriev]

Is it possible to update the version of paragonie/sodium_compat as well? As per package readme v.1 doesn't support PHP 8.

[ADandyGuyInSpace]

Closing PR, moving to 3.0 branch for changes and support, as well as integrating with the new mock framework