Bump julia-actions/setup-julia from 2 to 3 (#7) #27

Job	Run time
Julia lts - windows-latest - push	3m 52s
Julia 1 - windows-latest - push	5m 12s
Julia 1 - macOS-latest - push	2m 44s
Julia 1 - ubuntu-latest - push	4m 0s
Julia lts - ubuntu-latest - push	2m 56s
Julia lts - macOS-latest - push	2m 52s
	21m 36s

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