[sonic-swss-common] Update submodule (#6197)

Including commits in sonic-swss-common repo:
```
40e695d 2020-12-12 | [pyext] Implement DBConnector::pubsub() to emulate python Redis.pubsub() (#427) [Qi Luo]
9a2bf6c 2020-12-12 | Add fdb_flush.v2.lua script to makefile (#425) [Kamil Cudnik]
7d60e7e 2020-12-07 | Handle exception in Select (#424) [Qi Luo]
```
This commit is contained in:
Qi Luo 2020-12-13 11:34:15 -08:00 committed by GitHub
parent 25826626aa
commit 6db01243d9
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@ -1 +1 @@
Subproject commit cf9cc37547bcbec8ac32c3f651335dfdb4b0f635
Subproject commit 40e695d2f5f19a9fb24e3c2303af296d93f8074a