Merge pull request #655 from scala-steward/update/8.x/patches

[8.x] Patch updates

Author: mkurz

project/Dependencies.scala

@@ -9,7 +9,7 @@ import sbt._
 object Dependencies {
 
   object ScalaVersions {
-    val scala212 = "2.12.20"
+    val scala212 = "2.12.21"
     val scala213 = "2.13.18"
     val scala3   = "3.3.7"
   }