bump: Scala 2.13.12 (#1859) #1153

Job	Run time
Checks	4m 24s
Compile and test (2.13)	7m 53s
Compile Benchmarks	4m 1s
Compile and test (3.3)	7m 58s
Docs	7m 19s
Gradle tests	5m 59s
Maven tests	6m 54s
sbt scripted tests (gen-scala-server, 2.13)	13m 27s
sbt scripted tests (gen-java, 2.13)	7m 4s
sbt scripted tests (scala-2_13, 2.13)	6m 7s
sbt scripted tests (scala3, 3.3)	5m 55s
	1h 17m 1s

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