antigravity: takes a ReadableBuffer (#9012)

Author: JelleZijlstra

stdlib/antigravity.pyi

@@ -1 +1,3 @@
-def geohash(latitude: float, longitude: float, datedow: bytes) -> None: ...
+from _typeshed import ReadableBuffer
+
+def geohash(latitude: float, longitude: float, datedow: ReadableBuffer) -> None: ...