common/Release.key: update
Looks like the key already expired again. This key is now valid until
2024-08-02 according to
$ gpg --import Release.key
$ gpp --list-keys
Key added again from:
https://download.opensuse.org/repositories/network:/osmocom:/nightly/Debian_11/Release.key
Change-Id: I56a8708ae55cc4cc5928cd80bb57d63f32e22423
