Update scala-library to 2.12.17 (#560)

Co-authored-by: Seth Tisue <seth@tisue.net>

Author: scala-steward

build.sbt

@@ -51,7 +51,7 @@ lazy val root = project
 lazy val junit = libraryDependencies += "com.github.sbt" % "junit-interface" % "0.13.3" % Test
 
 lazy val scala211 = "2.11.12"
-lazy val scala212 = "2.12.16"
+lazy val scala212 = "2.12.17"
 lazy val scala213 = "2.13.10"
 lazy val scala3   = "3.1.3"