Bump actions/setup-python from 2 to 4 #72

Job	Run time
PHP CS Fixer	17s
PHP Static Analysis (7.1)	16s
PHP Static Analysis (7.2)	19s
PHP Static Analysis (7.3)	14s
PHP Static Analysis (7.4)	22s
PHP Static Analysis (8.0)	13s
PHP Static Analysis (8.1)	15s
PHPUnit (7.1)	28s
PHP Static Analysis (8.2)	14s
PHPUnit (7.2)	26s
PHP Static Analysis (8.3)	33s
PHPUnit (7.3)	32s
PHPUnit (7.4)	23s
PHPUnit (8.0)	21s
Roave Backwards Compatibility Check	10s
PHPUnit (8.1)	24s
PHPUnit (8.2)	26s
PHPUnit (8.3)	49s
	6m 42s

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