Upgrade to Scala 2.12.12

Author: ijuma

build.sbt

@@ -48,7 +48,7 @@ lazy val root = project
 lazy val junit = libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % Test
 
 lazy val scala211 = "2.11.12"
-lazy val scala212 = "2.12.11"
+lazy val scala212 = "2.12.12"
 lazy val scala213 = "2.13.2"
 
 lazy val compat = MultiScalaCrossProject(JSPlatform, JVMPlatform, NativePlatform)(