CI: added PHP 8.4 #681

Job	Run time
PHPUnit (PHP 7.2)	19s
Tests alternative autoloader (PHP 7.1)	6s
PHPUnit (PHP 7.3)	14s
PHPUnit Composer v2 (PHP 7.4)	19s
Tests alternative autoloader (PHP 7.2)	9s
PHPUnit (PHP 7.4)	26s
Tests alternative autoloader (PHP 7.3)	6s
PHPUnit (PHP 8.0)	14s
Tests alternative autoloader (PHP 7.4)	3s
PHPUnit coverage (PHP 7.4)	22s
PHPUnit (PHP 8.1)	20s
PHPUnit (PHP 8.2)	4s
Tests alternative autoloader (PHP 8.0)	4s
PHPUnit (PHP 8.3)	3s
PHPUnit (PHP 7.1)	13s
Tests alternative autoloader (PHP 8.1)	3s
PHPUnit (PHP 8.4)	3s
Tests alternative autoloader (PHP 8.2)	2s
Tests alternative autoloader (PHP 8.3)	2s
PHPUnit lowest deps (PHP 7.3)	13s
Tests alternative autoloader (PHP 8.4)	2s
Windows-Tests with PHP 7.1	39s
Windows-Tests with PHP 7.2	34s
Windows-Tests with PHP 7.3	38s
Windows-Tests with PHP 7.4	36s
Windows-Tests with PHP 8.0	36s
Windows-Tests with PHP 8.1	33s
Windows-Tests with PHP 8.2	34s
Windows-Tests with PHP 8.3	34s
Windows-Tests with PHP 8.4	34s
	8m 45s

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