use dependabot (#428) #1612

Job	Run time
Julia 1 - macos-latest - x64 - push	16m 33s
Julia 1 - ubuntu-latest - x64 - push	9m 56s
Julia lts - ubuntu-latest - x64 - push	8m 46s
Julia lts - macos-latest - x64 - push	5m 3s
Julia pre - ubuntu-latest - x64 - push	1m 31s
Julia 1 - windows-latest - x64 - push	9m 17s
Julia lts - windows-latest - x64 - push	5m 32s
	56m 38s

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