Update coursier to 2.1.18 (#1769) #2324

Job	Run time
build (2_12, e2e)	3m 19s
conformance	1m 47s
build (2_12, test)	9m 49s
build (2_13, e2e)	3m 53s
build (2_13, test)	11m 12s
build (3, e2e)	4m 9s
build (3, test)	10m 17s
build (2_12, examples_and_formatting)	3m 9s
build (2_13, scala3_compat_test)	10m 30s
build (3, scala3_compat_test)	7m 53s
ci-passed	1s
	1h 5m 59s

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