[py-swsssdk] Submodule Update (#5249)

Change:
  c25d492 Merge pull request #83 from tahmed-dev/taahme/add-redis-pipeline-operation
  198d143 review comments - part of [configdb] Add Ability to Query/Update Redis Using Pipelines
  994851c review comments - part of [configdb] Add Ability to Query/Update Redis Using Pipelines
  2d2b7e1 making lgtm happy - part of [configdb] Add Ability to Query/Update Redis Using Pipelines
  fa9093c [configdb] Add Ability to Query/Update Redis Using Pipelines

signed-off-by: Tamer Ahmed <tamer.ahmed@microsoft.com>