gh-36073: Stop sorting Graph vertices and edges by default
Following #22349 and #27408, we finally set parameter `sort` to `False`
by default for methods `vertices` and `edges`, and remove the
corresponding deprecation warnings.
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URL: https://github.com/sagemath/sage/pull/36073
Reported by: David Coudert
Reviewer(s): Matthias Köppe
