CI: added PHP 8.4 #679

Job	Run time
PHPUnit Composer v2 (PHP 7.4)	1m 17s
PHPUnit (PHP 7.2)	53s
PHPUnit (PHP 7.3)	35s
PHPUnit (PHP 7.4)	47s
PHPUnit (PHP 7.1)	34s
PHPUnit coverage (PHP 7.4)	1m 9s
PHPUnit (PHP 8.0)	33s
PHPUnit (PHP 8.1)	40s
PHPUnit (PHP 8.2)	1s
Tests alternative autoloader (PHP 7.1)	13s
PHPUnit lowest deps (PHP 7.3)	3m 23s
PHPUnit (PHP 8.3)	1s
Tests alternative autoloader (PHP 7.2)	12s
Tests alternative autoloader (PHP 7.3)	11s
PHPUnit (PHP 8.4)	1s
Tests alternative autoloader (PHP 7.4)	8s
Windows-Tests with PHP 7.1	53s
Tests alternative autoloader (PHP 8.0)	27s
Windows-Tests with PHP 7.2	53s
Tests alternative autoloader (PHP 8.1)	7s
Windows-Tests with PHP 7.3	1m 1s
Tests alternative autoloader (PHP 8.2)	6s
Windows-Tests with PHP 7.4	58s
Tests alternative autoloader (PHP 8.3)	11s
Windows-Tests with PHP 8.0	57s
Tests alternative autoloader (PHP 8.4)	28s
Windows-Tests with PHP 8.1	53s
Windows-Tests with PHP 8.2	55s
Windows-Tests with PHP 8.3	43s
Windows-Tests with PHP 8.4	48s
	19m 58s

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