[TEST] Test with the v8.x version of php-css-parser #2354

Job	Run time
Composer Validate (8.3)	8s
PHP Lint (7.3)	8s
PHP Lint (7.4)	8s
PHP Lint (8.0)	9s
PHP Lint (8.1)	12s
PHP Lint (8.2)	11s
PHP Lint (8.3)	8s
PHP Lint (8.4)	11s
Unit tests (7.3, highest)	12s
Static Analysis (composer:normalize, 8.3)	1m 38s
Unit tests (7.4, highest)	11s
Static Analysis (php:fixer, 8.3)	1m 39s
Static Analysis (php:md, 8.3)	1m 32s
Unit tests (8.0, highest)	11s
Static Analysis (php:rector, 8.3)	1m 13s
Unit tests (8.1, highest)	12s
Static Analysis (php:stan, 8.3)	1m 33s
Unit tests (8.2, highest)	12s
Unit tests (8.3, highest)	15s
Unit tests (8.4, highest)	11s
	10m 14s

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