Update scala3-library to 3.4.3

Author: scala-steward

build.sc

@@ -17,7 +17,7 @@ import com.github.lolgab.mill.mima._
 val scala212  = "2.12.18"
 val scala213  = "2.13.11"
 
-val scala3   = "3.4.2"
+val scala3   = "3.4.3"
 val scalaNative = "0.5.0"
 val acyclic = "0.3.12"