CI: added PHP 8.4 #677

Job	Run time
Tests alternative autoloader (PHP 7.1)	35s
PHPUnit (PHP 7.2)	3m 0s
Tests alternative autoloader (PHP 7.2)	35s
PHPUnit Composer v2 (PHP 7.4)	44s
PHPUnit (PHP 7.3)	2m 58s
Tests alternative autoloader (PHP 7.3)	11s
PHPUnit (PHP 7.4)	2m 50s
Tests alternative autoloader (PHP 7.4)	8s
PHPUnit (PHP 8.0)	3m 27s
PHPUnit coverage (PHP 7.4)	1m 4s
Tests alternative autoloader (PHP 8.0)	11s
PHPUnit (PHP 8.1)	2m 54s
PHPUnit (PHP 7.1)	2m 52s
Tests alternative autoloader (PHP 8.1)	11s
PHPUnit (PHP 8.2)	2m 49s
PHPUnit lowest deps (PHP 7.3)	41s
PHPUnit (PHP 8.3)	3m 4s
Tests alternative autoloader (PHP 8.2)	8s
PHPUnit (PHP 8.4)	2m 58s
Tests alternative autoloader (PHP 8.3)	8s
Windows-Tests with PHP 7.1	56s
Tests alternative autoloader (PHP 8.4)	11s
Windows-Tests with PHP 7.2	47s
Windows-Tests with PHP 7.3	50s
Windows-Tests with PHP 7.4	47s
Windows-Tests with PHP 8.0	43s
Windows-Tests with PHP 8.1	6s
Windows-Tests with PHP 8.2	1s
Windows-Tests with PHP 8.3	1s
Windows-Tests with PHP 8.4	1s
	35m 51s

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