Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/94314f9..425295f

TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org

Change-Id: If6f2893e829c4f03e52cd869fbb7f261a6aa53c2
Reviewed-on: https://chromium-review.googlesource.com/c/1303539Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#57050}

DEPS

@@ -13,7 +13,7 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + '94314f9b01dca91f64cf294584471a855b6f1d5a',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '425295f6cff0b886e0b7c982e63265e91778b962',
   'v8/third_party/depot_tools':
     Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '2b71832f6d8dc74119589992836cf95aeb8a9842',
   'v8/third_party/icu':