[bug#57298] [PATCH 2/5] gnu: Add ocaml-pprint.

[pukkamustard]

Hi!

Julien Lepiller <julien@lepiller.eu> writes:

> guix lint complains this package is not the latest version. Indeed,
> it's 2 years old when there are newer versions. The latest version
> seems to work fine. Why do you need this version precisely?

Absolutely right. Only reason for me to include the old version was
ignorance.

Updated to most recent version (20220103) in V2.