Feature: #107725 - Support username for authentication in Redis cache backend 

See forge#107725

Description 

Since Redis 6.0, it is possible to authenticate against Redis using both a username and a password. Prior to this version, authentication was only possible with a password. With this patch, you can now configure the TYPO3 Redis cache backend as follows:

config/system/additional.php 
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pages']['backend']
    = \TYPO3\CMS\Core\Cache\Backend\RedisBackend::class;
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pages']['options']
    = [
        'defaultLifetime' => 86400,
        'database' => 0,
        'hostname' => 'redis',
        'port' => 6379,
        'username' => 'redis',
        'password' => 'redis',
    ];
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Impact 

The "password" configuration option of the Redis cache backend is now typed as a array|string. Setting this configuration option with an array is deprecated and will be removed in 15.0.