bump: scala-library 2.12.20 (was 2.12.19) #1486

Job	Run time
Checks	5m 1s
Gradle tests	7m 23s
Compile Benchmarks	5m 4s
Compile and test (2.13)	8m 30s
Compile and test (3.3)	8m 14s
Maven tests	6m 43s
sbt scripted tests (gen-scala-server, 2.13)	11m 7s
sbt scripted tests (gen-java, 2.13)	7m 44s
sbt scripted tests (scala-2_13, 2.13)	6m 26s
sbt scripted tests (scala3, 3.3)	6m 50s
	1h 13m 2s

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