Update actions/download-artifact digest to d3f86a1 #84

Job	Run time
Checkout JUnit reports	13s
Generate split indexes	6s
Test #2	33s
Test #0	35s
Test #3	35s
Test #1	49s
Merge JUnit reports with existing branch	22s
Merge JUnit reports with new branch	26s
	3m 39s

Provide feedback