add a new model

model.py

@@ -723,6 +723,7 @@ lithuanian_models = {
 }
 
 latvian_models = {
+    "csukuangfj/vits-piper-lv_LV-aivars-medium": _get_vits_piper,
     "csukuangfj/vits-coqui-lv-cv": _get_vits_piper,
 }