fix: security fix

app/schemas/auth/language_schema.py

@@ -1,4 +1,10 @@
 from pydantic import BaseModel
+from enum import Enum
+
+class LanguageEnum(str, Enum):
+    """Supported languages for the application."""
+    EN = "en"
+    AR = "ar"
 
 class UpdateLanguageRequest(BaseModel):
-    preferred_language: str
+    preferred_language: LanguageEnum