[submodule] Update sonic-swss submodule

62e6c5a [bitmap_vnet] Remove BMTOR implementation (sonic-net#1494)
582beae [FPMSYNCD] EVPN Type5 prefix handling in FPMSYNCD (sonic-net#1326)
d9ca6e2 [vstest] Resolve intermittent timing failure in test_fgnhg.py (sonic-net#1495)
a89b8ed [sub intf] Inherit parent port mtu changes (sonic-net#1479)

Signed-off-by: Volodymyr Samotiy <volodymyrs@nvidia.com>