Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows … #138

Job	Run time
PHPUnit (false, 7.1, highest)	2m 28s
PHPUnit (false, 7.2, highest)	2m 39s
PHPUnit (false, 7.3, highest)	2m 38s
PHPUnit (false, 7.4, highest)	20s
PHPUnit (false, 8, highest)	2m 29s
PHPUnit (false, 8.1, highest)	2m 28s
PHPUnit (false, 8.2, highest)	2m 30s
PHPUnit (7.1, lowest, true)	2m 30s
PHPUnit (8, lowest, true)	2m 30s
Upload coverage to Coveralls	23s
	20m 55s

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