remove trailing whitespace

Author: jyalim

Lib/_strptime.py

@@ -628,7 +628,7 @@ def parse_int(s):
                 year = 1
             else:
                 # in line with other format directives, negative numbers
-                # are not supported by the regular expression; 
+                # are not supported by the regular expression;
                 # this branch will not trigger!
                 msg = f"Negative century unsupported ({found_dict[group_key]})"
                 raise ValueError(msg)