[submodule]: update sonic-utilities

* 0a145e8 2021-08-17 | Revert "[config][generic-update] Implementing patch sorting (sonic-net#1599)" (HEAD, origin/master, origin/HEAD) [Guohan Lu]
* dbcc6fd 2021-08-16 | [config reload]: fix the condition for checking if system is starting (sonic-net#1766) (HEAD, origin/master, origin/HEAD) [Guohan Lu]
* 2c7cfaa 2021-08-17 | [sonic-package-manager] switch from poetry-semver to semantic_version due to bugs found in poetry-semver (sonic-net#1710) [Stepan Blyshchak]
* 7821a3f 2021-08-13 | [vnet_route_check] don't hardcode prefix length of /24 (sonic-net#1756) [Stepan Blyshchak]
* 4175cb9 2021-08-11 | [show priority-group drop counters] Add user info output when user want to check PG counters and polling are disabled (sonic-net#1678) [Andriy Yurkiv]
* 920bb87 2021-08-10 | [config][generic-update] Implementing patch sorting (sonic-net#1599) [Mohamed Ghoneim]
* 30907c4 2021-08-06 | [config][interface][speed] Fixed the config interface speed in multiasic issue (sonic-net#1739) [Marty Y. Lok]
* 4b88e0e 2021-08-06 | [minigraph] Donot enable PFC watchdog for MgmtTsToR (sonic-net#1734) [Blueve]

Signed-off-by: Guohan Lu <lguohan@gmail.com>