Bump actions/upload-artifact from 3.1.2 to 3.1.3 #626

Job	Run time
Julia Test Runner	3m 28s
Julia 1.6 - ubuntu-latest	54s
Julia 1.6 - windows-latest	9m 51s
Julia 1.6 - macOS-latest	5m 59s
Julia 1 - ubuntu-latest	1m 24s
Julia 1 - windows-latest	2m 26s
Julia 1 - macOS-latest	2m 3s
Julia nightly - ubuntu-latest	1m 22s
Julia nightly - windows-latest	3m 20s
Julia nightly - macOS-latest	2m 12s
	32m 59s

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