Update gitlab requirement from ~> 4.0 to >= 4, < 6 #282

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Run time

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Job	Run time
rubocop	21s
test (2.7)	1m 48s
test (3.0)	1m 36s
test (3.1, yes)	1m 41s
test (3.2)	1m 28s
Test suite	1s
	6m 55s