Update TFRT dependency to use revision
http://github.com/tensorflow/runtime/commit/fbdd15997f4495011fed44d051152a2a69436e69.

PiperOrigin-RevId: 410224846
Change-Id: Id9ff35275aa0788c8881fd329b20bf1757033117
diff --git a/third_party/tf_runtime/workspace.bzl b/third_party/tf_runtime/workspace.bzl
index 3285b49..f1c7aab 100644
--- a/third_party/tf_runtime/workspace.bzl
+++ b/third_party/tf_runtime/workspace.bzl
@@ -6,8 +6,8 @@
     """Imports TFRT."""
 
     # Attention: tools parse and update these lines.
-    TFRT_COMMIT = "b6508f2ddc666b6f9f98e7cd8a76450245204456"
-    TFRT_SHA256 = "0924807c774e977b317169066273aee6ae2c20959ce8b07556cc15ebb13ded6e"
+    TFRT_COMMIT = "fbdd15997f4495011fed44d051152a2a69436e69"
+    TFRT_SHA256 = "49a74b16d4a62696de8740910e8418ac89c06f527422dc5d8a8844ee57e29853"
 
     tf_http_archive(
         name = "tf_runtime",