tests/CLI: update gpg key

The gpg expires on 2024-06-12 (see [1]) which makes all tests fail using the
key. Therefore extend the expiration to 50 year as suggested in [2].

[1]: intel#116
[2]: #1 (comment)

Signed-off-by: Jörg Sommer <joerg.sommer@navimatix.de>

Author: jo-so-nx