[swss] back track swss submodule head (sonic-net#7913)

Why I did it
There is a regression on 2700 platform where the evidence points to the flex counter change.

How I did it
Back track the swss submodule head to exclude:

[flex-counters] Delay flex counters stats init for faster boot time (sonic-net#1749)
Verified that image build from this PR doesn't trigger the crash.

Signed-off-by: Ying Xie ying.xie@microsoft.com