Update coursier to 2.1.18 #2323

Job	Run time
conformance	1m 38s
build (2_12, e2e)	3m 23s
build (2_12, test)	9m 30s
build (2_13, e2e)	4m 7s
build (2_13, test)	12m 17s
build (3, e2e)	4m 9s
build (3, test)	13m 26s
build (2_12, examples_and_formatting)	2m 32s
build (2_13, scala3_compat_test)	7m 0s
build (3, scala3_compat_test)	10m 18s
ci-passed	1s
	1h 8m 21s

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