debian: add missing bcrypt to manager .requires

The `ceph-mgr` package lost its dependency on `python3-bcrypt` when
the dependencies got moved from d/control to a dh_python3 compatible
requires file. Add it again as the bcrypt module is still used there.

Otherwise one gets errors when, e.g., calling `ceph -s` after a fresh
installation:

> 13 mgr modules have failed dependencies
> Module 'balancer' has failed dependency: No module named 'bcrypt'
> Module 'crash' has failed dependency: No module named 'bcrypt'
> Module 'devicehealth' has failed dependency: No module named 'bcrypt'
> Module 'iostat' has failed dependency: No module named 'bcrypt'
> Module 'nfs' has failed dependency: No module named 'bcrypt'
> Module 'orchestrator' has failed dependency: No module named 'bcrypt'
> Module 'pg_autoscaler' has failed dependency: No module named 'bcrypt'
> Module 'progress' has failed dependency: No module named 'bcrypt'
> Module 'rbd_support' has failed dependency: No module named 'bcrypt'
> Module 'restful' has failed dependency: No module named 'bcrypt'
> Module 'status' has failed dependency: No module named 'bcrypt'
> Module 'telemetry' has failed dependency: No module named 'bcrypt'
> Module 'volumes' has failed dependency: No module named 'bcrypt'

Fixes: https://tracker.ceph.com/issues/63637
Fixes: ef19547 ("debian: add .requires for specifying python3 deps")
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
(cherry picked from commit adc501c)

debian/ceph-mgr.requires

@@ -1,3 +1,4 @@
+bcrypt
 pyOpenSSL
 cephfs
 ceph-argparse