rsa crate vulnerability fix

[joaofrf]

Describe the feature

The current version of the rsa crate used by zenoh-transport version 1.1.0 has a vulnerability
https://rustsec.org/advisories/RUSTSEC-2023-0071

It would be nice to have an alternative to this, since it has been an open issue on their end for quite a while and doesn't seem to be merged any time soon
RustCrypto/RSA#390

[joaofrf]

Note: unsure what label to set, since this is technically not a bug nor a "new feature"