Merge pull request #289 from scala-steward/update/scala-library-2.12.16

Update scala-library to 2.12.16

Author: satabin

build.sbt

@@ -1,7 +1,7 @@
 import scalariform.formatter.preferences._
 import sbtcrossproject.CrossPlugin.autoImport.{crossProject, CrossType}
 
-val scala212 = "2.12.13"
+val scala212 = "2.12.16"
 val scala213 = "2.13.8"
 val scala3 = "3.0.0"