_read_channel_raw fix, longint support

Author: FoamyGuy

adafruit_hx711/hx711.py

@@ -122,8 +122,8 @@ def _read_channel_raw(self, chan_gain: int) -> int:
             self._clock_pin.value = False
 
         # Convert to 32-bit signed integer
-        if value & 0x800000:
-            value |= 0xFF000000
+        if value & 0x80_00_00:
+            value -= 0x1_00_00_00
 
         return value