Update coursier to 2.1.6 (#1562) #1842

Job	Run time
conformance	2m 0s
build (2_12, mima)	1m 24s
build (2_12, e2e)	6m 36s
build (2_12, proptest)	12m 22s
build (2_13, mima)	1m 28s
build (2_13, e2e)	4m 55s
build (2_13, proptest)	13m 58s
build (3, mima)	7s
build (3, e2e)	4m 46s
build (3, proptest)	13m 59s
build (2_12, examples_and_formatting)	3m 21s
ci-passed	1s
	1h 4m 57s

Provide feedback