Update scala-library to 2.12.19

build.sbt

@@ -29,7 +29,7 @@ lazy val versions = new {
   val munit = "0.7.29"
   val reactor = "0.8.0"
   val reactorGrpc = "1.2.3"
-  val scala212 = "2.12.16"
+  val scala212 = "2.12.19"
   val scala213 = "2.13.8"
 }