continuous-integration.yml: Simplified on-part #654

Job	Run time
PHPUnit coverage (PHP 7.4)	59s
PHPUnit Composer v2 (PHP 7.4)	52s
PHPUnit (PHP 7.2)	47s
Tests alternative autoloader (PHP 7.1)	7s
PHPUnit (PHP 7.3)	28s
Tests alternative autoloader (PHP 7.2)	7s
PHPUnit (PHP 7.4)	35s
Tests alternative autoloader (PHP 7.3)	7s
PHPUnit (PHP 8.0)	39s
PHPUnit (PHP 7.1)	38s
Tests alternative autoloader (PHP 7.4)	7s
PHPUnit (PHP 8.1)	39s
PHPUnit lowest deps (PHP 7.3)	52s
Tests alternative autoloader (PHP 8.0)	10s
PHPUnit (PHP 8.2)	28s
Tests alternative autoloader (PHP 8.1)	6s
PHPUnit (PHP 8.3)	35s
Windows-Tests with PHP 7.1	1m 8s
Tests alternative autoloader (PHP 8.2)	9s
Tests alternative autoloader (PHP 8.3)	7s
Windows-Tests with PHP 7.2	1m 1s
Windows-Tests with PHP 7.3	1m 2s
Windows-Tests with PHP 7.4	1m 1s
Windows-Tests with PHP 8.0	59s
Windows-Tests with PHP 8.1	1m 4s
Windows-Tests with PHP 8.2	1m 2s
Windows-Tests with PHP 8.3	57s
	16m 46s

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