fixed small issue

Author: ShashankZobb

python/0128-longest-consecutive-sequence.py

@@ -1,5 +1,5 @@
 class Solution:
-    def longestConsecutive(self, nums: list[int]) -> int:
+    def longestConsecutive(self, nums: List[int]) -> int:
         numSet = set(nums)
         longest = 0