Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/4fd0dec..b031112

TBR=machenbach@chromium.org,tmrts@chromium.org,v8-waterfall-sheriff@grotations.appspotmail.com

Change-Id: Ic9a9082919cc7de8c816c33dcc62d219440a342c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2567562Reviewed-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@{#71542}

DEPS

@@ -88,7 +88,7 @@ vars = {
 
 deps = {
   'build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + '4fd0dec37b78efe519e20bb4bdbf0e503339579d',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + 'b031112684a2a4ee47da9dd91d9aa50e17ab14d4',
   'third_party/depot_tools':
     Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '6d2a0fef93155cb26724fbc0430f7a6f1d1aaed1',
   'third_party/icu':