[11.x] feat: use phpredis 6 in ci #38175

Job	Run time
PHP 8.2 - PHPUnit 10.5 - prefer-lowest	2m 18s
PHP 8.2 - PHPUnit 10.5 - prefer-stable	2m 51s
PHP 8.2 - PHPUnit 11.0.1 - prefer-lowest	2m 25s
PHP 8.2 - PHPUnit 10.5 - prefer-lowest - Windows	6m 3s
PHP 8.2 - PHPUnit 11.0.1 - prefer-stable	2m 22s
PHP 8.2 - PHPUnit 10.5 - prefer-stable - Windows	5m 34s
PHP 8.3 - PHPUnit 10.5 - prefer-lowest	2m 24s
PHP 8.2 - PHPUnit 11.0.1 - prefer-lowest - Windows	4m 14s
PHP 8.3 - PHPUnit 10.5 - prefer-stable	2m 19s
PHP 8.2 - PHPUnit 11.0.1 - prefer-stable - Windows	5m 36s
PHP 8.3 - PHPUnit 11.0.1 - prefer-lowest	2m 35s
PHP 8.3 - PHPUnit 10.5 - prefer-lowest - Windows	5m 44s
PHP 8.3 - PHPUnit 10.5 - prefer-stable - Windows	4m 28s
PHP 8.3 - PHPUnit 11.0.1 - prefer-stable	2m 27s
PHP 8.3 - PHPUnit 11.0.1 - prefer-lowest - Windows	4m 29s
PHP 8.3 - PHPUnit 11.0.1 - prefer-stable - Windows	6m 1s
	1h 1m 50s

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