`bodhi updates download`: Exit code >0 if something failed

[LecrisUT]

The most direct case I can see is in

bodhi/bodhi-client/bodhi/client/cli.py

Lines 916 to 918 in 7aac212

	ret = subprocess.call(args)
	if ret:
	click.echo(f"WARNING: download of {build['nvr']} failed!", err=True)

This should exit non-zero when it failed. Caught this issue in rmdepcheck on Fedora CI, but there the failure is even more tricky, and I do not know where to trace back the cause there, so I would like someone else to look into properly implementing this.

[mattiaverga]

Should be fixed by bodhi-client 25.11.3
Update submitted to testing