Resolve today's new cargo-audit errors
To resolve the openssl error
(https://rustsec.org/advisories/RUSTSEC-2023-0072)
we just upgrade to a more recent openssl.
To resolve the rsa error, we add an exception
to our cargo-audit script:
Our use of the rsa crate is safe
because we don't do any private-key rsa operations.
(There is not yet a fixed constant-time version
of the rsa crate.)
Edited by Nick Mathewson