Auto merge of #57516 - pietroalbini:beta-rollup, r=pietroalbini

[beta] Rollup backports

Cherry-picked:

* #57355: use the correct supertrait substitution in `object_ty_for_trait`
* #57471: Updated RELEASES.md for 1.32.0

Rolled up:

* #57483: [beta] Uniform path backports
  * c658d73: resolve: Avoid "self-confirming" resolutions in import validation
  * #57160: resolve: Fix an ICE in import validation
  * #56759: Stabilize `uniform_paths`

r? @ghost