Update manifest-required-hashes according to the Council-approved plan
outlined in [1]. The Portage version supporting BLAKE2B is amd64-stable
for 3 months already.
[1]:https://archives.gentoo.org/gentoo-dev/message/
682618f6d1cf4d63b30577cb1e9bd269
# The following hashes are required on all Manifest entries. If any
# of them are missing, repoman will refetch and rehash old distfiles.
# Otherwise, old distfiles will keep using their current hash set.
-manifest-required-hashes = SHA512
+manifest-required-hashes = BLAKE2B
# 2013-04-09 gentoo's council says to deprecate EAPIs 1 and 2 (bug #470670).
# 2014-02-25 council meeting deprecated EAPIs 0 and 3.