Update openweave-core submodule to 748e8cae9aea6c0f19ad872c4c494057babb3fee
Update openweave-core submodule to 748e8cae9aea6c0f19ad872c4c494057babb3fee

openweave/openweave-nrf52840-lock-example,openweave/openweave-nrf52840-lock-example,openweave/openweave-nrf52840-lock-example