[202012] [sonic-swss] Update submodule (#8522)

Why I did it
Update the sonic-swss submodule for the 202012 branch. The following is the new commit in the submodule.

c1cb2ca [202012] Backport SAI failure handling to 202012 branch (#1880)

How I did it
Update the sonic-swss submodule pointer for the 202012 branch.