sysutils/shim: Deprecate port

Last commit on the master branch upstream is 10 years ago.
The port does not build with GCC 14 [1].

Give 1 month for expiration date.

The port might be fixed by switching upstream to
https://github.com/rhboot/shim (actual upstream is a fork of this repo,
which is still active) and patching appropriately.
Still, I believe it makes more sense to deprecate and expire the port
since:

• apparently nobody felt the need for a more up to date version of shim;
• there are important security issues which are most likely not

addressed by the actual port
(e.g. https://github.com/advisories/GHSA-qjqj-4cq6-6f2f)

PR: 281248 [1]