chore: fix sass deprecation with mixed declaration in nested rules #6200

Job	Run time
php8.1 on master integration tests	1m 14s
php8.1 on stable30 integration tests	1m 6s
php8.1 on master unit tests	1m 15s
php8.2 on master integration tests	2m 6s
php8.1 on stable30 unit tests	1m 9s
php8.2 on stable30 integration tests	2m 8s
php8.2 on master unit tests	2m 12s
php8.3 on master integration tests	1m 30s
php8.2 on stable30 unit tests	2m 14s
php8.3 on stable30 integration tests	1m 48s
php8.3 on master unit tests	1m 53s
php8.3 on stable30 unit tests	1m 47s
php-test-summary	5s
	20m 27s

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