Update TFRT dependency to use revision
Update TFRT dependency to use revision
http://github.com/tensorflow/runtime/commit/28da0975d11f4efd9167d63d4dcce04ec60db5d6.

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/11714 from dimvar:device-info-tostring 15d36e3dcde6637f91a28e56658cdde9a81eaae3
