Don't upgrade centos-9-stream repos in the Schutzfile, the newer ones
are broken. Considering CI is broken on main right now, that takes
priority, fixing centos-9 can be done in a followup.
The RPM GPG release key used by Red Hat to sign its content used to be
signed using SHA-1. SHA-1 is no longer accepted on RHEL-10 / c10s and as
a result, such key can't be imported during image build. The RH GPG
release key has been resigned using SHA256 some time ago. Let's use this
version of the key for all RHEL repositories.
The key is taken from:
https://access.redhat.com/security/team/key
Specifically:
https://access.redhat.com/security/data/fd431d51.txt
The second key (auxiliary key 3) was not changed.
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
