[202205][sairedis]advance submodule head

update sai module with commit

- 566d4a8ef2 2022-08-11 | [SAI-PTF] Enable saiserverv2 with syncd-rpc and fix saithriftv2 build (#1552) (#1533) (#1514) (#1492) (#1558) (#1557) [Richard.Yu]
- a1796a53cc 2022-08-11 | Add support of mdio IPC server class using sai switch api and unix socket

Signed-off-by: richardyu-ms <richard.yu@microsoft.com>