Add backup storage locations for dependencies.

PiperOrigin-RevId: 313502729

Author: broken

WORKSPACE

@@ -27,6 +27,7 @@ http_archive(
     sha256 = "acd93f6baaedc4414ebd08b33bebca7c7a46888916101d8c0b8083573526d070",
     strip_prefix = "abseil-cpp-43ef2148c0936ebf7cb4be6b19927a9d9d145b8f",
     urls = [
+        "https://storage.googleapis.com/mirror.tensorflow.org/github.com/abseil/abseil-cpp/archive/43ef2148c0936ebf7cb4be6b19927a9d9d145b8f.tar.gz",
         "https://github.com/abseil/abseil-cpp/archive/43ef2148c0936ebf7cb4be6b19927a9d9d145b8f.tar.gz",
     ],
 )
@@ -75,6 +76,7 @@ http_archive(
     strip_prefix = "icu-release-64-2",
     sha256 = "dfc62618aa4bd3ca14a3df548cd65fe393155edd213e49c39f3a30ccd618fc27",
     urls = [
+        "https://storage.googleapis.com/mirror.tensorflow.org/github.com/unicode-org/icu/archive/release-64-2.zip",
         "https://github.com/unicode-org/icu/archive/release-64-2.zip",
     ],
     build_file = "//third_party/icu:BUILD.bzl",