Add scalasteward

Author: thesamet

.scala-steward.conf

@@ -2,3 +2,10 @@
 updates.ignore = [
   { groupId = "com.google.protobuf" }
 ]
+
+updates.pin = [
+  # Scala 3.3 is the LTS release
+  { groupId = "org.scala-lang", artifactId = "scala3-compiler", version = "3.3." }
+  { groupId = "org.scala-lang", artifactId = "scala3-library", version = "3.3." }
+  { groupId = "org.scala-lang", artifactId = "scala3-library_sjs1", version = "3.3." }
+]