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

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

Author: pre-commit-ci[bot]

maths/special_numbers/deficient_numbers.py

@@ -55,4 +55,4 @@ def is_deficient_number(number: int) -> bool:
 if __name__ == "__main__":
     import doctest
 
-    doctest.testmod()
+    doctest.testmod()