Fixes <https://issues.guix.gnu.org/76301>.
The ‘dns’ provision collides with that of Knot.
* gnu/services/dns.scm (unbound-shepherd-service): Remove dns from provision.
Change-Id: Ice774a9a338416e865dbc4d26a8f37243f084a35
Signed-off-by: Ludovic Courtès <ludo@gnu.org>