[202012][submodule update] Update submodule sonic-swss

[bingwang-ms]

Signed-off-by: bingwang bingwang@microsoft.com

Why I did it

Changes include

d29a49a [ACL] Match TCP protocol while matching TCP_FLAG (#1854)
2569ad9 Fix sFlow sampling-rate and admin-state (#1728)
8908a8f Change rif_rates.lua and port_rates.lua scripts to calculate rates correct (#1848)
b42c2fb [VS Test] Skip flaky tests (#1875)

How I did it

How to verify it

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

• 201811
• 201911
• 202006
• 202012
• 202106

Description for the changelog

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