Update TFRT dependency to use revision http://github.com/tensorflow/runtime/commit/878e622d94e89fc91e1f51dfc0f47086726af5be.
Update TFRT dependency to use revision
http://github.com/tensorflow/runtime/commit/878e622d94e89fc91e1f51dfc0f47086726af5be.

PiperOrigin-RevId: 484656513

google/tsl,google/tsl,google/tsl