debian: drop explicit libprotobuf dependency from ceph-osd-crimson

debian: drop explicit libprotobuf dependency from ceph-osd-crimson

The ceph-osd-crimson package already lists ${shlibs:Depends} in its
Depends field, which generates the correct libprotobuf dependency for
the target distribution at build time (e.g. libprotobuf32t64 on
Trixie/Noble). The hardcoded libprotobuf23 entry is redundant and
breaks installations on distributions where protobuf ships under a
different package name.

See also ab4c5daead7f26d41028625453d50bb58d3b02be which added this
runtime dep.

Signed-off-by: Kefu Chai <k.chai@proxmox.com>