Fix linting errors

Author: vnlitvinov

pandas/_libs/lib.pyx

@@ -2398,7 +2398,7 @@ cpdef object _concat_date_cols(tuple date_cols,
         Py_ssize_t sequence_size, i, j
         Py_ssize_t array_size, min_size = 0
         object[:] result_view
-        object[:,:] arrays_view
+        object[:, :] arrays_view
 
         flatiter it
         int all_numpy = 1
@@ -2407,7 +2407,6 @@ cpdef object _concat_date_cols(tuple date_cols,
         object array
         list list_to_join
 
-
     keep_numbers = keep_trivial_numbers
     sequence_size = len(date_cols)
 
@@ -2441,7 +2440,6 @@ cpdef object _concat_date_cols(tuple date_cols,
             for i in range(sequence_size):
                 iters_view[i] = PyArray_IterNew(date_cols[i])
 
-
         result = np.zeros(min_size, dtype=object)
         result_view = result