Update turbo_alignment/metrics/registry.py

Co-authored-by: Aleksey Malakhov <[email protected]>

turbo_alignment/metrics/registry.py

@@ -30,7 +30,7 @@ class DistinctnessSettings(MetricSettings):
     ngram: int = 5
 
     @field_validator('ngram', mode='before')
-    def check_ngram(cls, value: int):
+    def check_ngram(cls, value: int) -> int:
         if value <= 0:
             raise ValueError('ngram should be greater that 0')
         return value