Update the OP25 generator model to take either a string or an int

app/models.py

@@ -1,5 +1,5 @@
 from pydantic import BaseModel
-from typing import List, Optional
+from typing import List, Optional, Union
 from enum import Enum
 
 
@@ -25,7 +25,7 @@ class TalkgroupTag(BaseModel):
 class ConfigGenerator(BaseModel):
     type: DecodeMode
     systemName: str
-    channels: List[str]
+    channels: List[Union[int, str]]
     tags: Optional[List[TalkgroupTag]]
     whitelist: Optional[List[int]]