Update calendar.pyi timegm to accept arbitrary length tuples

timegm takes struct_time objects, which are NamedTuples that have 9 elements by default
That would not take Tuple[Int], so typeshed would report errors

stdlib/3/calendar.pyi

@@ -72,4 +72,4 @@ c = ...  # type: TextCalendar
 def setfirstweekday(firstweekday: int) -> None: ...
 def format(cols: int, colwidth: int = ..., spacing: int = ...) -> str: ...
 def formatstring(cols: int, colwidth: int = ..., spacing: int = ...) -> str: ...
-def timegm(tuple: Tuple[int]) -> int: ...
+def timegm(tuple: Tuple[int, ...]) -> int: ...