Update scala-library to 2.12.17

Author: scala-steward

build.sbt

@@ -53,7 +53,7 @@ val commonSettings = Seq(
   organizationName := "Evolution",
   organizationHomepage := Some(url("http://evolution.com")),
   scalaVersion := crossScalaVersions.value.head,
-  crossScalaVersions := Seq("2.13.7", "2.12.15"),
+  crossScalaVersions := Seq("2.13.7", "2.12.17"),
   releaseCrossBuild := true,
   licenses := Seq(("MIT", url("https://opensource.org/licenses/MIT"))),
   publishTo := Some(Resolver.evolutionReleases),