Do not use a shell in `proc_open()` if not really needed #947

Job	Run time
Coding Guidelines	52s
Dependency Validation	7s
Type Checker	27s
Unit Tests (ubuntu-latest, 8.1)	9s
Unit Tests (ubuntu-latest, 8.2)	15s
Unit Tests (ubuntu-latest, 8.3)	12s
Unit Tests (ubuntu-latest, 8.4)	11s
Unit Tests (windows-latest, 8.1)	38s
Unit Tests (windows-latest, 8.2)	35s
Unit Tests (windows-latest, 8.3)	36s
Unit Tests (windows-latest, 8.4)	35s
End-to-End Tests (ubuntu-latest, 8.1)	35s
End-to-End Tests (ubuntu-latest, 8.2)	39s
End-to-End Tests (ubuntu-latest, 8.3)	44s
End-to-End Tests (ubuntu-latest, 8.4)	43s
End-to-End Tests (windows-latest, 8.1)	1m 42s
End-to-End Tests (windows-latest, 8.2)	1m 39s
End-to-End Tests (windows-latest, 8.3)	1m 39s
End-to-End Tests (windows-latest, 8.4)	1m 33s
Build PHAR	28s
Code Coverage	1m 17s
Test PHAR (8.1, pcov)	16s
Test PHAR (8.1, xdebug)	31s
Test PHAR (8.2, pcov)	17s
Test PHAR (8.2, xdebug)	36s
Test PHAR (8.3, pcov)	21s
Test PHAR (8.3, xdebug)	39s
Test PHAR (8.4, pcov)	18s
Test PHAR (8.4, xdebug)	31s
	19m 5s

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