continuous-integration.yml: added PHP 8.4 to the list #663

Job	Run time
PHPUnit (PHP 7.1)	37s
PHPUnit Composer v2 (PHP 7.4)	26s
PHPUnit (PHP 7.2)	33s
PHPUnit coverage (PHP 7.4)	1m 3s
PHPUnit (PHP 7.3)	46s
Tests alternative autoloader (PHP 7.1)	10s
PHPUnit (PHP 7.4)	32s
PHPUnit lowest deps (PHP 7.3)	29s
PHPUnit (PHP 8.0)	41s
Windows-Tests with PHP 7.1	1m 16s
Windows-Tests with PHP 7.2	1m 3s
PHPUnit (PHP 8.1)	28s
Windows-Tests with PHP 7.3	57s
PHPUnit (PHP 8.2)	28s
Windows-Tests with PHP 7.4	1m 0s
PHPUnit (PHP 8.3)	37s
Windows-Tests with PHP 8.0	50s
PHPUnit (PHP 8.4)	46s
Tests alternative autoloader (PHP 7.2)	14s
Tests alternative autoloader (PHP 7.3)	15s
Windows-Tests with PHP 8.1	57s
Tests alternative autoloader (PHP 7.4)	9s
Tests alternative autoloader (PHP 8.0)	7s
Windows-Tests with PHP 8.2	1m 1s
Tests alternative autoloader (PHP 8.1)	7s
Windows-Tests with PHP 8.3	56s
Tests alternative autoloader (PHP 8.2)	8s
Windows-Tests with PHP 8.4	55s
Tests alternative autoloader (PHP 8.3)	9s
Tests alternative autoloader (PHP 8.4)	6s
	17m 46s

Provide feedback