Update scala-library to 2.12.19

Author: scala-steward

build.sbt

@@ -2,7 +2,7 @@ import com.softwaremill.SbtSoftwareMillBrowserTestJS._
 import com.softwaremill.SbtSoftwareMillCommon.commonSmlBuildSettings
 import com.softwaremill.Publish.ossPublishSettings
 
-val scala2_12 = "2.12.18"
+val scala2_12 = "2.12.19"
 val scala2_13 = "2.13.12"
 val scala2 = List(scala2_12, scala2_13)
 val scala3 = List("3.3.1")