fix: allow ED25519 public key algorithm in FIPS mode

Previously ED25519 was not on the default public key algorithms, but
this is actually allowed in FIPS 140-3. `curve25519-sha256` is not an
allowed key exchange, but as the FIPS 140-3 PDF mentions:
mentions:

Curves that are included in SP 800-186 but not included in SP
800-56Arev3 are not approved for key agreement. E.g., the ECDH X25519
and X448 key agreement schemes (defined in RFC 7748) that use Curve25519
and Curve448, respectively, are not compliant to SP 800-56Arev3.