created 2023 dev gmm group

src/main/java/gov/usgs/earthquake/nshmp/gmm/Gmm.java

@@ -1371,6 +1371,11 @@ public enum Gmm {
             CB_14_BASIN,
             CY_14_BASIN)),
 
+    WUS_23_ACTIVE_CRUST(
+        "2023 Development",
+        List.of(
+            BSSA_14_CYBERSHAKE_ADJ)),
+
     WUS_14_INTERFACE(
         "2014 Subduction Interface (WUS)",
         List.of(