GHC 8.8's base-4.13.0.0 removes `fail` from Monad, requiring a few
uses of `fail` to be removed and the json dependency to be updated.

Because arbitrary `Monad` instances no longer support failure, the
`Monad m` used in the return type of Network.Gitit.Rpxnow.authenticate
has been fixed as `Either String`.

This also fixes type mismatches that prevent compiling with
hoauth-1.9.x

network-3.0.0.0 moves the Network.BSD module into its own
"network-bsd" package and removes deprecated API elements.  This
requires a new dependency on "network-bsd" and a code change to stop
using the removed inet_addr function.

This change also adds < 3.2 as an upper bound for network (there was
previously no upper bound).

The changes to EntryContent in feed-1.2.0.0 were reverted in 1.3.0.0

http://hackage.haskell.org/package/feed-1.3.0.0/changelog

haskell-party/feed#35

Updating to feed-1.3.0.0 required simply reverting the changes to
Network.Gitit.Feed which were made in commit
d783f12.  The changed versions from
that commit are retained using CPP to switch them in so that
feed-1.2.x remains supported for now.

The Linux CI builds were all failing because `cabal v2-test all`
exited with an error when called, due to there being no tests.