[Pkg-rust-maintainers] Bug#1055895: Bug#1055895: rust-self-cell: RUSTSEC-2023-0070

[Peter Green]

> 
> Please see https://rustsec.org/advisories/RUSTSEC-2023-0070.html

I have read the upstream advisory and the linked bug report and while
I don't fully understand the nitty gritty details my understanding of
the issue is.

* It was discovered that code (which was not marked as unsafe)
   could mis-use self-cell in a way that invoked undefined
   behaviour.
* This was fixed by adding an additional compile time check
   which will cause the build to fail in such cases.

Based on this understanding I have

* Uploaded the new version of rust-self-cell
* Performed a rebuild test of the only reverse dependency
   rust-coreutils, it built successfully, so presumably it is
   not impacted by this issue.