Update actions/download-artifact digest to d3f86a1 #83

Job	Run time
Checkout JUnit reports	19s
Generate split indexes	4s
Test #3	24s
Test #2	24s
Test #1	23s
Test #0	36s
Merge JUnit reports with existing branch	1m 21s
Merge JUnit reports with new branch	23s
	3m 54s

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