Fix PHP 8.5 deprecation for PDO::MYSQL_ATTR_SSL_CA

[jbrooksuk]

Summary

• Replace deprecated PDO::MYSQL_ATTR_SSL_CA with Pdo\Mysql::ATTR_SSL_CA on PHP 8.4+, falling back to the old constant on PHP 8.2/8.3.
• Avoids the PHP 8.5 deprecation notice: Constant PDO::MYSQL_ATTR_SSL_CA is deprecated since 8.5, use Pdo\Mysql::ATTR_SSL_CA instead.

The new Pdo\Mysql class was introduced in PHP 8.4, so a PHP_VERSION_ID check is required while composer.json still allows php: ^8.2.

Test plan

• Boot the app on PHP 8.5 and confirm the deprecation no longer fires.
• Boot the app on PHP 8.2/8.3 and confirm PDO::MYSQL_ATTR_SSL_CA is still used (no Class "Pdo\Mysql" not found error).
• Verify MySQL/MariaDB connections still negotiate SSL when MYSQL_ATTR_SSL_CA is set.

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