Upgrade openssh to 8.4p1-5+deb11u1 (sonic-net#11408)

Why I did it
Cherry-pick: sonic-net#11405
Fix the openssh build issue, upgrade from 8.4p1-5 to 8.4p1-5+deb11u1.

https://dev.azure.com/mssonic/build/_build/results?buildId=120209&view=logs&j=88ce9a53-729c-5fa9-7b6e-3d98f2488e3f&t=8d99be27-49d0-54d0-99b1-cfc0d47f0318

+ sudo dpkg --root=./fsroot-broadcom -i target/debs/bullseye/openssh-server_8.4p1-5_amd64.deb
dpkg: warning: downgrading openssh-server from 1:8.4p1-5+deb11u1 to 1:8.4p1-5
(Reading database ... 44818 files and directories currently installed.)
Preparing to unpack .../openssh-server_8.4p1-5_amd64.deb ...
Unpacking openssh-server (1:8.4p1-5) over (1:8.4p1-5+deb11u1) ...
dpkg: dependency problems prevent configuration of openssh-server:
 openssh-server depends on openssh-client (= 1:8.4p1-5); however:
  Version of openssh-client on system is 1:8.4p1-5+deb11u1.

dpkg: error processing package openssh-server (--install):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 openssh-server
+ clean_sys

How I did it
Upgrade openssh from 8.4p1-5 to 8.4p1-5+deb11u1.

rules/openssh.mk

@@ -1,6 +1,6 @@
 # openssh package
 
-OPENSSH_VERSION = 8.4p1-5
+OPENSSH_VERSION = 8.4p1-5+deb11u1
 
 export OPENSSH_VERSION