update bazel-toolchains pin (#126)

Author: nlopezgi

WORKSPACE

@@ -52,10 +52,10 @@ skydoc_repositories()
 
 http_archive(
     name = "bazel_toolchains",
-    sha256 = "c3b08805602cd1d2b67ebe96407c1e8c6ed3d4ce55236ae2efe2f1948f38168d",
-    strip_prefix = "bazel-toolchains-5124557861ebf4c0b67f98180bff1f8551e0b421",
+    sha256 = "cefb6ccf86ca592baaa029bcef04148593c0efe8f734542f10293ea58f170715",
+    strip_prefix = "bazel-toolchains-cdea5b8675914d0a354d89f108de5d28e54e0edc",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/archive/5124557861ebf4c0b67f98180bff1f8551e0b421.tar.gz",
-        "https://github.com/bazelbuild/bazel-toolchains/archive/5124557861ebf4c0b67f98180bff1f8551e0b421.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/archive/cdea5b8675914d0a354d89f108de5d28e54e0edc.tar.gz",
+        "https://github.com/bazelbuild/bazel-toolchains/archive/cdea5b8675914d0a354d89f108de5d28e54e0edc.tar.gz",
     ],
 )