CI: Increase 'Setup QEMU' timeout to 15 minutes

We've seen Fedora 42 still setting up after 10 min.  Change the timeout
to 15 min.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #17697

.github/workflows/zfs-qemu.yml

@@ -78,7 +78,7 @@ jobs:
         ref: ${{ github.event.pull_request.head.sha }}
 
     - name: Setup QEMU
-      timeout-minutes: 10
+      timeout-minutes: 15
       run: .github/workflows/scripts/qemu-1-setup.sh
 
     - name: Start build machine