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

qiluo-msft · web-flow · commit 6db01243d9fd · 2020-12-13T11:34:15.000-08:00
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] ```
diff --git a/src/sonic-swss-common b/src/sonic-swss-common
@@ -1 +1 @@
-Subproject commit cf9cc37547bcbec8ac32c3f651335dfdb4b0f635
+Subproject commit 40e695d2f5f19a9fb24e3c2303af296d93f8074a
