Migrate PKCS11 from "engine" to "provider"
OpenSSL 3.0.0 has deprecated the
engine api in favour of the
provider api. We currently use the
engine api and OpenSC for pkcs11 access to HSMs. We need to move to using the
provider api as soon as possible.
OpenSC has an open ticket for OpenSSL 3.0.0 https://github.com/OpenSC/OpenSC/issues/2308