do not include parent in hash of parking functions #34824
Description
We do not want the following:
sage: P = ParkingFunctions(3)
sage: f = P([1,1,1])
sage: g = ParkingFunction([1,1,1])
sage: f in P
True
sage: g in P
True
sage: f in list(P)
True
sage: g in list(P)
True
sage: f in set(P)
True
sage: g in set(P)
False
CC: @nthiery
Component: combinatorics
Author: Martin Rubey
Branch/Commit: 49ff03d
Reviewer: Travis Scrimshaw
Issue created by migration from https://trac.sagemath.org/ticket/34824