korg-toolchains: Add 12.3.0 and 13.1.0

Author: mpe

external/korg-toolchains/Makefile

@@ -50,7 +50,9 @@ ARCHES := alpha \
 	x86_64 \
 	xtensa
 
-VERSIONS := 12.2.0 \
+VERSIONS := 13.1.0 \
+	12.3.0 \
+	12.2.0 \
 	12.1.0 \
 	11.3.0 \
 	11.1.0 \