Convert to int to not break datashader CI for numpy 2

[hoxbro]

Basic this is failing on datashader, note it only fails when numba is disabled.

import os 
os.environ['NUMBA_DISABLE_JIT'] = '1' 

from numba import jit
import numpy as np

ngjit = jit(nopython=True, nogil=True)

bin_vec = np.array([1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
      dtype=np.uint8)
@ngjit
def _binary_2_int(bin_vec):
    """Convert a binary byte array to an integer"""
    res = 0
    next_val = 1
    width = len(bin_vec)
    for i in range(width):
        res += next_val*bin_vec[width - i - 1]
        next_val <<= 1
    return res

_binary_2_int(bin_vec)

OverflowError                             Traceback (most recent call last)
Cell In[4], line 18
     15         next_val <<= 1
     16     return res
---> 18 _binary_2_int(bin_vec)

Cell In[4], line 13, in _binary_2_int(bin_vec)
     10 width = len(bin_vec)
     11 for i in range(width):
     12     # res += next_val*int(bin_vec[width - i - 1])
---> 13     res += next_val*bin_vec[width - i - 1]
     15     next_val <<= 1
     16 return res

OverflowError: Python integer 256 out of bounds for uint8