Merge pull request #392 from softwaremill/update/scala-library-2.12.16

Update scala-library, scala-reflect to 2.12.16

Author: mergify[bot]

build.sbt

@@ -4,7 +4,7 @@ import sbt.Reference.display
 import com.softwaremill.SbtSoftwareMillCommon.commonSmlBuildSettings
 import com.softwaremill.Publish.{ossPublishSettings, updateDocs}
 
-val scala212 = "2.12.15"
+val scala212 = "2.12.16"
 val scala213 = "2.13.6"
 val scala3 = "3.1.0"