[Submodule] update sonic-restapi (#12288)

Update sonic-restapi submodule for the following commits:

86543d0 - 2022-10-05 : Updates to route PATCH API (#129) [Sumukha Tumkur Vani]
a1af82c - 2022-09-21 : Install libyang to azure pipeline (#128) [Hua Liu]
2007c4c - 2022-09-09 : Increase coverage threshold (#126) [Sumukha Tumkur Vani]