Update pin.py

Author: frank-pet

src/adafruit_blinka/microcontroller/bcm2711/pin.py

@@ -2,8 +2,11 @@
 #
 # SPDX-License-Identifier: MIT
 """Broadcom BCM2711 pin names"""
-import lgpio
+
+# pylint: disable=unused-import
+# importing CHIP to make the lgpio CHIP handle available
 from adafruit_blinka.microcontroller.bcm283x.pin import Pin, CHIP
+# pylint: enable=unused-import
 
 D0 = Pin(0)
 D1 = Pin(1)