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Don't run proc_open_cmd.phpt in parallel with other tests #665

Job	Run time
FREEBSD	11m 56s
LINUX_X64_${{ ((matrix.debug && 'DEBUG') \|\| 'RELEASE') }}_${{ ((matrix.zts && 'ZTS') \|\| 'NTS') }}${{ ((matrix.asan && '_ASAN') \|\| '') }}	0s
BENCHMARKING	0s
LINUX_X32_DEBUG_ZTS	0s
MACOS_DEBUG_NTS	0s
WINDOWS_X64_ZTS	0s
	11m 56s

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