#### Why I did it
The current redis version of SONiC is `6.0.6`, which contains many high-risky security issues like CVEs that are fixed in the latest version. The Redis release notes also highly recommend to upgrade with SECURITY urgency.
```
================================================================================
Redis 6.0.16 Released Mon Oct 4 12:00:00 IDT 2021
================================================================================
Upgrade urgency: SECURITY, contains fixes to security issues.
Security Fixes:
* (CVE-2021-41099) Integer to heap buffer overflow handling certain string
commands and network payloads, when proto-max-bulk-len is manually configured
to a non-default, very large value [reported by yiyuaner].
* (CVE-2021-32762) Integer to heap buffer overflow issue in redis-cli and
redis-sentinel parsing large multi-bulk replies on some older and less common
platforms [reported by Microsoft Vulnerability Research].
* (CVE-2021-32687) Integer to heap buffer overflow with intsets, when
set-max-intset-entries is manually configured to a non-default, very large
value [reported by Pawel Wieczorkiewicz, AWS].
* (CVE-2021-32675) Denial Of Service when processing RESP request payloads with
a large number of elements on many connections.
* (CVE-2021-32672) Random heap reading issue with Lua Debugger [reported by
Meir Shpilraien].
* (CVE-2021-32628) Integer to heap buffer overflow handling ziplist-encoded
data types, when configuring a large, non-default value for
hash-max-ziplist-entries, hash-max-ziplist-value, zset-max-ziplist-entries
or zset-max-ziplist-value [reported by sundb].
* (CVE-2021-32627) Integer to heap buffer overflow issue with streams, when
configuring a non-default, large value for proto-max-bulk-len and
client-query-buffer-limit [reported by sundb].
* (CVE-2021-32626) Specially crafted Lua scripts may result with Heap buffer
overflow [reported by Meir Shpilraien].
Other bug fixes:
* Fix appendfsync to always guarantee fsync before reply, on MacOS and FreeBSD (kqueue) (#9416)
* Fix the wrong mis-detection of sync_file_range system call, affecting performance (#9371)
* Fix replication issues when repl-diskless-load is used (#9280)
```
#### How I did it
Edit `Dockerfile.j2` file
#### How to verify it
Check redis version
#### Description for the changelog
This PR will upgrade redis-server version to `6.0.16`.
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