Feature: #107802 - Support username and password in Redis session backend 

See forge#107802

Description 

Since Redis 6.0, it is possible to authenticate against Redis using both a username and a password. Before that, authentication was possible by password only. This change means the TYPO3 Redis session backend can be configured as follows:

config/system/additional.php 
use TYPO3\CMS\Core\Session\Backend\RedisSessionBackend;

$GLOBALS['TYPO3_CONF_VARS']['SYS']['session']['BE'] = [
    'backend' => RedisSessionBackend::class,
    'options' => [
        'database' => 0,
        'hostname' => 'redis',
        'port' => 6379,
        'username' => 'redis',
        'password' => 'redis',
    ],
];
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Impact 

The password configuration option of the Redis session backend is now typed as array|string. Setting this configuration option to an array is deprecated and will be removed in TYPO3 v15.0.