fix: casefold strings before querying (#3554)

Author: Sacul0457

bot/exts/info/pep.py

@@ -125,7 +125,7 @@ async def pep_slash_command_autocomplete(self, interaction: Interaction, query:
             return []
 
         # list[('pep_num - pep_title', similarity, pep_number)]
-        result = process.extract(query=query, choices=self.pep_autocomplete_choices, limit=10)
+        result = process.extract(query=query, choices=self.pep_autocomplete_choices, limit=10, processor=str.casefold)
         return [app_commands.Choice(name=pep[0], value=pep[2]) for pep in result]