Fix _richcmp_ in morphism.pyx

[jdemeyer]

#23485 mistakenly used def _richcmp_ instead of cpdef _richmp_.

CC: @saraedum @roed314

Component: coercion

Author: Jeroen Demeyer

Branch/Commit: f1c779f

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/23750

[jdemeyer]

Branch: u/jdemeyer/fix__richcmp__in_morphism_pyx

[jdemeyer]

New commits:

f1c779f

Fix `_richcmp_` signature

[jdemeyer]

Commit: f1c779f

[jdemeyer]

Author: Jeroen Demeyer

[tscrim]

comment:3

I believe these also need to be declared in the pxd file, correct?

[jdemeyer]

comment:4

Replying to @tscrim:

I believe these also need to be declared in the pxd file, correct?

No because it's already declared in element.pxd

[tscrim]

Reviewer: Travis Scrimshaw

[tscrim]

comment:5

Okay. LGTM.

[vbraun]

Changed branch from u/jdemeyer/fix__richcmp__in_morphism_pyx to f1c779f