[sonic-platform-common] submodule update (sonic-net#6669)

This PR updates the following commits in sonic-platform-common
6ad0004 [component] add auto_update_firmware() to support the auto update. (sonic-net#106)
49076a9 [sonic_y_cable] Add support for measuring BER and EYE scan and running Loopback, PRBS modes on the Y cable (sonic-net#158)
6b12b4c [sfp] Add parsing the dom_capability to sff8472 (sonic-net#102)
7fc76b9 [sonic_pcie] Add get_pcie_aer_stats and its common implementation (sonic-net#144)

Signed-off-by: vaibhav-dahiya <vdahiya@microsoft.com>