Update scala-library to 2.12.19 #420

Job	Run time
Mima binary compatibility test	1m 14s
scala-2.12.19 jdk-8 tests	1m 55s
scalajs-1.5.1 scala-2.12.19 jdk-8 tests	1m 42s
scala-2.13.6 jdk-8 tests	1m 53s
scalajs-1.5.1 scala-2.13.6 jdk-8 tests	1m 36s
scala-3.0.0 jdk-8 tests	1m 49s
scalajs-1.5.1 scala-3.0.0 jdk-8 tests	1m 33s
scala-2.12.19 jdk-11 tests	2m 25s
scalajs-1.5.1 scala-2.12.19 jdk-11 tests	1m 52s
scala-2.13.6 jdk-11 tests	2m 11s
scalajs-1.5.1 scala-2.13.6 jdk-11 tests	1m 50s
scala-3.0.0 jdk-11 tests	2m 12s
scalajs-1.5.1 scala-3.0.0 jdk-11 tests	1m 52s
publish	0s
	24m 4s

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