[202012][utilities] advance utilities submodule head

* 647f01f 2021-09-30 | [fstrim] limit smartctl execution time to 30 seconds (sonic-net#1850) (HEAD -> 202012, github/202012) [Ying Xie]
* 371970e 2021-09-30 | [202012][show techsupport] address show techsupport return none zero code issue (sonic-net#1847) [Ying Xie]
* 81a8386 2021-09-30 | Disable pfcwd forward action config for cisco-8000. (sonic-net#1848) [Alpesh Patel]

Signed-off-by: Ying Xie <[email protected]>