Parent richcmp: never use id()

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See #22029.

Component: **coercion**

Keywords: **richcmp, days94**

Author: **Frédéric Chapoton**

Branch/Commit: **[`9cf0503`](https://github.com/sagemath/sagetrac-mirror/commit/9cf050319e9d5caad61dc8e24096968e3514a60c)**

Reviewer: **Jeroen Demeyer**

_Issue created by migration from https://trac.sagemath.org/ticket/22344_

