phosphor-inventory-manager: srcrev bump ebff814fb7..55f9eae440

Patrick Williams (2):
      sdbusplus: remove deprecated variant_ns
      sdbusplus: replace message::variant with std::variant

(From meta-phosphor rev: f0db6faf3f965c367aadd8aa6ea8a6d859f35686)

Change-Id: I65d2f44e94e879bcfdbf534214001b2522145d20
Signed-off-by: Andrew Geissler <openbmcbump-github@yahoo.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>