Update TFRT dependency to use revision http://github.com/tensorflow/runtime/commit/70429640c2a77073910b46a9ce1577ad1e8fe254.
Update TFRT dependency to use revision
http://github.com/tensorflow/runtime/commit/70429640c2a77073910b46a9ce1577ad1e8fe254.

PiperOrigin-RevId: 398418976
Change-Id: I9822bbba6a2c3ab8834053643e3b5a76ad14bd6a

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