[202205][submodule] Advance sonic-swss pointer

Update sonic-swss submodule pointer to include the following:
* fb68ca8 [202205] [ACL] dereg acl-rule counters during acl-table del (sonic-net#2574) ([sonic-net#2582](sonic-net/sonic-swss#2582))
* 8c9092c [202205] Fixed set mtu for deleted subintf due to late notification ([sonic-net#2595](sonic-net/sonic-swss#2595))

Signed-off-by: dprital <drorp@nvidia.com>