Update V8 DEPS.

DEPS

 # Note: The buildbots evaluate this file with CWD set to the parent
 # directory and assume that the root of the checkout is in ./v8/, so
 # all paths in here must match this assumption.
 
 vars = {
   "git_url": "https://chromium.googlesource.com",
 }
 
 deps = {
   "v8/build/gyp":
     Var("git_url") + "/external/gyp.git" + "@" + "5122240c5e5c4d8da12c543d82b03d6089eb77c5",
   "v8/third_party/icu":
     Var("git_url") + "/chromium/deps/icu.git" + "@" + "508e9274baaa5caa8de9cf4c26a24e926a15ccf0",
   "v8/buildtools":
-    Var("git_url") + "/chromium/buildtools.git" + "@" + "f0b8022601cf9c3c1a2f7efcea48e2fe81d3b143",
+    Var("git_url") + "/chromium/buildtools.git" + "@" + "565d04e8741429fb1b4f26d102f2c6c3b849edeb",
   "v8/testing/gtest":
     Var("git_url") + "/external/googletest.git" + "@" + "9855a87157778d39b95eccfb201a9dc90f6d61c6",
   "v8/testing/gmock":
     Var("git_url") + "/external/googlemock.git" + "@" + "0421b6f358139f02e102c9c332ce19a33faf75be",
   "v8/tools/clang":
     Var("git_url") + "/chromium/src/tools/clang.git" + "@" + "86b91f8203d8b6cb2dabb8a9c5f2dd95135b4307",
 }
 
 deps_os = {
   "android": {
@@ skipping 82 matching lines @@
     'name': 'clang',
     'pattern': '.',
     'action': ['python', 'v8/tools/clang/scripts/update.py', '--if-needed'],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "v8/build/gyp_v8"],
   },
 ]