rpm: add R: qubes-core-admin-client

qubes-dom0-update script use qvm-run tool, which is in
qubes-core-admin-client package (python3-qubesadmin isn't enough).
Also, this should fix package installation order during install:
template needs to be installed after qubes-core-admin-client (for
qvm-template-postprocess tool). But we can't add this dependency there
directly, as it will not work on Qubes < 4.0.

rpm_spec/core-dom0-linux.spec

@@ -47,6 +47,7 @@ BuildRequires:  qubes-utils-devel >= 3.1.3
 BuildRequires:  qubes-libvchan-devel
 Requires:	qubes-core-dom0
 Requires:	python3-qubesadmin
+Requires:	qubes-core-admin-client
 Requires:	qubes-utils >= 3.1.3
 Requires:	%{name}-kernel-install
 Requires:	xdotool