debian/control: fix python3-cherrypy*3* dependency

debian/control: fix python3-cherrypy*3* dependency

The trailing '3' was missed in one instance, ceph-mgr-cephadm, leading to:

	Some packages could not be installed. This may mean that you have
	requested an impossible situation or if you are using the unstable
	distribution that some required packages have not yet been created
	or been moved out of Incoming.
	The following information may help to resolve the situation:

	The following packages have unmet dependencies:
	 ceph-mgr-cephadm : Depends: python3-cherrypy but it is not installable

Which makes the installation fail.

Fixes: 78983ad0d0cce422da32dc4876ac186f6d32c3f5
Signed-off-by: Koen Kooi <koen@softiron.com>