[sonic-swss-common]: Update Submodule (#6508)

Update in this change:
640a218 [packaging]: Add Support For Libboost v1.71.0 (#449)

signed-off-by: Tamer Ahmed <tamer.ahmed@microsoft.com>
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Tamer Ahmed 2021-01-21 12:11:04 -08:00 committed by GitHub
parent 21c3573607
commit 5c31f6d8cc
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Subproject commit 2f79bb49d13820f2c108e4e27a2a12181713662f
Subproject commit 640a218759b5b490d505cadaca652f4821bba878