Advisories for Cargo/Oqs package

Ward Beullens found a practical key-recovery attack against Rainbow. The level I parametersets are removed from liboqs starting from version 0.7.2. Find the scientific details in Breaking Rainbow Takes a Weekend on a Laptop. This means all the oqs::sig::Algorithm::RainbowI* variants are insecure.

Wouter Castryck and Thomas Decru presented an efficient key recovery attack on the SIDH protocol. As a result, the secret key of SIKEp751 can be recovered in a matter of hours. The SIKE and SIDH schemes will be removed from oqs 0.7.2. An efficient key recovery attack on SIDH (preliminary version)