base16-bytestring had new epoch (1.0) 3 month ago:
https://hackage.haskell.org/package/base16-bytestring-1.0.1.0/changelog
Which fixed the old return type to normal `Either String ByteString`.
`cryptohash-sha512` is stale for ~10-11 months and testsuite does not suport the
new `base16-bytesting` releases.