Update coursier to 2.1.9 #4284

Job	Run time
Scalafmt	2m 35s
testOlderScalaOnJVM (2.11.12)	3m 46s
++2.13.13 download-scala-library testsJVM/slow:test	3m 27s
testOlderScalaOnJVM (2.12.16)	3m 18s
testLatestScala (JVM, 2.12.19, 8)	3m 16s
communitytest/test	5m 25s
Windows tests	4m 15s
testOlderScalaOnJVM (2.12.17)	3m 2s
testLatestScala (JVM, 2.12.19, 21)	3m 15s
mima	6m 0s
testOlderScalaOnJVM (2.12.18)	2m 57s
testLatestScala (JVM, 2.13.13, 8)	3m 8s
testOlderScalaOnJVM (2.13.10)	3m 20s
testLatestScala (JVM, 2.13.13, 21)	3m 9s
testOlderScalaOnJVM (2.13.11)	3m 11s
testLatestScala (JS, 2.12.19, 8)	3m 43s
testOlderScalaOnJVM (2.13.12)	3m 2s
testLatestScala (JS, 2.12.19, 21)	3m 39s
testLatestScala (JS, 2.13.13, 8)	3m 34s
testLatestScala (JS, 2.13.13, 21)	3m 38s
testLatestScala (Native, 2.12.19, 8)	4m 24s
testLatestScala (Native, 2.12.19, 21)	4m 9s
testLatestScala (Native, 2.13.13, 8)	4m 20s
testLatestScala (Native, 2.13.13, 21)	4m 0s
	1h 28m 33s

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