Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/2d9fa32..3bf1aad

TBR=machenbach@chromium.org,tmrts@chromium.org

Change-Id: Iea4e3425c2474e1035fe054fbe198a03ccea11f3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807003Reviewed-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@{#63820}

DEPS

@@ -71,7 +71,7 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + '2d9fa324552744383dcf0dc611f4cbc11a6c4559',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '3bf1aad87c989aa5a4e603430f2b1336e17e8f1d',
   'v8/third_party/depot_tools':
     Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '2c210a490857380a93f8308dd504aeb1ef759d38',
   'v8/third_party/icu':