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

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

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