Add video_link for GMC Sierra (#26506)

* Add video_link for GMS Sierra

* fix precommit

Co-authored-by: Shane Smiskol <shane@smiskol.com>
old-commit-hash: 187f8c177a

selfdrive/car/gm/values.py

@@ -100,7 +100,7 @@ CAR_INFO: Dict[str, Union[GMCarInfo, List[GMCarInfo]]] = {
   CAR.BOLT_EUV: GMCarInfo("Chevrolet Bolt EUV 2022-23", "Premier or Premier Redline Trim without Super Cruise Package", "https://youtu.be/xvwzGMUA210", footnotes=[], harness=Harness.gm),
   CAR.SILVERADO: [
     GMCarInfo("Chevrolet Silverado 1500 2020-21", "Safety Package II", footnotes=[], harness=Harness.gm),
-    GMCarInfo("GMC Sierra 1500 2020-21", "Driver Alert Package II", footnotes=[], harness=Harness.gm),
+    GMCarInfo("GMC Sierra 1500 2020-21", "Driver Alert Package II", "https://youtu.be/5HbNoBLzRwE", footnotes=[], harness=Harness.gm),
   ],
   CAR.EQUINOX: GMCarInfo("Chevrolet Equinox 2019-22", footnotes=[], harness=Harness.gm),
 }