[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

sorts/merge_sort.py

@@ -15,6 +15,7 @@
 
 class Comparable(Protocol):
     """Defines minimal comparison operations required for sorting."""
+
     def __lt__(self, other: Any) -> bool: ...
     def __le__(self, other: Any) -> bool: ...