[sonic-swss-common] Update submodule (#5126)

* src/sonic-swss-common ed9c497...00bcd1d (6):
  > [warmboot] add disable warmstart timer value (#370)
  > Update .gitignore (#372)
  > Fix swss::exec return value (#368)
  > Revert "DBConnector classes to understand the namespace. (#364)" (#369)
  > DBConnector classes to understand the namespace. (#364)
  > Added new table in APPL_Db for DNAT Pool changes (#367)

Author: jleveque