Update scala-library to 2.12.21

typelevel-steward[bot] · typelevel-steward[bot] · commit 98089a8e8ed2 · 2025-12-12T00:27:47.000Z
diff --git a/build.sbt b/build.sbt
@@ -1,4 +1,4 @@
-val Scala212 = "2.12.20"
+val Scala212 = "2.12.21"
 val Scala213 = "2.13.16"
 val Scala3Version = "3.3.4"
 
