[TEST] Test with the v8.x version of php-css-parser #2301

Job	Run time
PHP Lint (7.3)	6s
Composer Validate (8.3)	12s
PHP Lint (7.4)	13s
PHP Lint (8.0)	11s
PHP Lint (8.1)	8s
PHP Lint (8.2)	9s
PHP Lint (8.3)	12s
PHP Lint (8.4)	12s
Static Analysis (composer:normalize, 8.3)	21s
Static Analysis (php:fixer, 8.3)	19s
Unit tests (7.3, highest)	14s
Static Analysis (php:md, 8.3)	17s
Unit tests (7.4, highest)	11s
Static Analysis (php:rector, 8.3)	26s
Unit tests (8.0, highest)	12s
Static Analysis (php:stan, 8.3)	24s
Unit tests (8.1, highest)	12s
Unit tests (8.2, highest)	12s
Unit tests (8.3, highest)	11s
Unit tests (8.4, highest)	10s
	4m 32s

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