[sonic-utilities]: Submodule update (#6760)

sonic-utilities 28d358f...f5b8a1e (22):
> Fix deprecation warnings (#1423)
> Fix: initialize SonicDBConfig differently for single or multi_asic (continued) (#1417)
> [multi-asic] show ip interface changes for multi asic (#1396)
> [show mux]: Sort output by intf name (#1418)
> [ci] Test and build package using Azure Pipelines (#1406)
> [GitHub] Tweak PR and issue templates (#1419)
> Import 'mock' module from 'unittest' library (#1415)
> Revert "Add FW dump with new SAI implementation (#1338)" (#1407)
> [config reload]: Restart macsec container (#1410)
> [pcieutil] Remove the warning message and change the config file location (#1362)
> Fix: initialize SonicDBConfig differently for single or multi_asic (#1409)
> Support shared headroom pool on top of dynamic buffer calculation (#1348)
> Fix unsupported fs.squashfs extraction in sonic-installer (#1366)
> [show] Use proper variable to avoid exception in natshow script (#1383)
> Set up CI with Azure Pipelines
> [config reload]: Restart mux container (#1401)
> Advertise ipv6 link local address (#1402)
> [storyteller] Enhance the storyteller utility (#1400)
> [show] Fix int status when portchannel is in the system (#1376)
> [config][show] cli support for retrieving ber, eye-info and configuring prbs, loopback on Y-cable  (#1386)
> Skip route check for tun0 interfaces (#1399)
> do not parse stderr to get correct routing stack (#1398)
> [storyteller] allow storyteller to work on downloaded logs (#1388)
> [vrf]: Fix freezing during interface binding (#1325)
> Use SonicV2Connector/ConfigDBConnector/SonicDBConfig from swsscommon instread of swsssdk (#1392)

Signed-off-by: Lawrence Lee <lawlee@microsoft.com>