Pyupgrade to Python 3.9 (#4718)

* Pyupgrade to Python 3.9

* updating DIRECTORY.md

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

project_euler/problem_001/sol1.py

@@ -26,7 +26,7 @@ def solution(n: int = 1000) -> int:
     0
     """
 
-    return sum([e for e in range(3, n) if e % 3 == 0 or e % 5 == 0])
+    return sum(e for e in range(3, n) if e % 3 == 0 or e % 5 == 0)
 
 
 if __name__ == "__main__":