[build] Fix sonic-host-services dependency deepdiff version issue (#13329)

Why I did it
sonic_host_services depends on deepdiff.
But latest deepdiff version has error.

How I did it
pin deepdiff to previous version.

How to verify it

Author: liushilongbuaa

sonic-slave-buster/Dockerfile.j2

@@ -456,6 +456,9 @@ RUN pip3 install pyang==2.4.0
 RUN pip2 install mmh3==2.5.1
 RUN pip3 install mmh3==2.5.1
 
+# For latest version error, use previous version
+RUN pip3 install deepdiff==6.2.2
+
 RUN apt-get install -y xsltproc
 
 # Install dependencies for isc-dhcp-relay build