fix: use CoderPrompts base class as type for AskCoder.gpt_prompts

aider/coders/ask_coder.py

@@ -1,9 +1,10 @@
 from .ask_prompts import AskPrompts
 from .base_coder import Coder
+from .base_prompts import CoderPrompts
 
 
 class AskCoder(Coder):
     """Ask questions about code without making any changes."""
 
     edit_format = "ask"
-    gpt_prompts = AskPrompts()
+    gpt_prompts: CoderPrompts = AskPrompts()