[sonic-utilites] Update submodule. (sonic-net#7172)

- 4d89510 - 2021-3-28 | [reboot] User-friendly reboot cause message for kernel panic (sonic-net#1486) [Yong Zhao]
- 1f1696a - 2021-3-26 | Add all parameter to show/clear queue watermark command (sonic-net#1149) [ Petro Bratash]

Signed-off-by: Yong Zhao <yozhao@microsoft.com>