howto/puppet: drop obsolete bits about upgrading

howto/puppet.md

@@ -1475,13 +1475,6 @@ others, see [issue 29387][] for details). A similar problem exists
 with custom Ruby code implemented for various functions, which is
 being replaced with Hiera ([issue 30020][]).
 
-The Puppet infrastructure being kept up to date with the latest
-versions in Debian but will require some work to port to Puppet 6, as
-the current deployment system ("puppetmaster") has been removed in
-that new release (see [issue 33588][]).
-
-[issue 33588]: https://gitlab.torproject.org/tpo/tpa/team/-/issues/33588
-
 ### Glossary
 
 This is a subset of the [Puppet glossary](https://puppet.com/docs/puppet/latest/glossary.html) to quickly get you