debian: include the new object_format.py file

[phlogistonjohn]

This was missed when adding object_format.py to the RPM packaging.

Fixes: https://tracker.ceph.com/issues/55758

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[adk3798]

https://pulpito.ceph.com/adking-2022-05-26_20:10:49-fs-wip-adk3-testing-2022-05-26-1442-distro-basic-smithi/

the mgr module dependency failures from https://tracker.ceph.com/issues/55758 don't seem to be occurring with this change added in

[vshankar]

LGTM