[sonic-saidredis]: Advance submodule (sonic-net#8153)

Update sonic-sairedis submodule to include below commits:
84fa50a Revert "[vs]: Start syncd by passing context configuration file and global context index. (sonic-net#832)" (sonic-net#859)
736dc3b Remove redudnant mention of platform cisco-8000 (sonic-net#856)
969ad94 Support for cisco-8000 platform for sonic-sairedis/syncd (sonic-net#823)
1eacd05 [sairedis] Client/Server add support for SAI stats api (sonic-net#855)
59fedfa [sairedis] Client/Server support SAI fdb flush api (sonic-net#853)
5c2aaae [syncd] bulk OID remove requires RID (sonic-net#854)
7da0894 [sairedis] Client/Server support SAI query API (sonic-net#848)
443ad36 [sairedis] Style refactor cleanup (sonic-net#850)

Signed-off-by: Suvarna Meenakshi <sumeenak@microsoft.com>