[202012][sonic-linkmgrd] update submodule

[zjswhhh]

commit aa8fe6deff466909909430f00598d2dba9490904 (HEAD -> 202012, origin/202012)
Author: Jing Zhang zhangjing@microsoft.com
Date: Tue Oct 11 10:22:02 2022 -0700

[Active-Standby] avoid posting mux metrics event when receiving unsolicited mux state notification  (#142)

Description of PR
Summary:
Fixes # (issue)

This PR is to fix incorrect mux metrics timestamps caused by unsolicited mux state notification.

Sign-off: Jing Zhang zhangjing@microsoft.com

sign-off: Jing Zhang zhangjing@microsoft.com

Why I did it

How I did it

How to verify it

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205

Description for the changelog

Ensure to add label/tag for the feature raised. example - PR#2174 under sonic-utilities repo. where, Generic Config and Update feature has been labelled as GCU.

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)