Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/7e2f4d2..bdbc779

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

Change-Id: I8bd1a6c205ca1edae9040e1b3a2fca7efed2fc81
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2315053Reviewed-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@{#69029}

DEPS

@@ -80,7 +80,7 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + '7e2f4d28efa74e1b995609f0fcd24dafcaf84227',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + 'bdbc779ea9e92988756e4992cee8e0c08c4018f6',
   'v8/third_party/depot_tools':
     Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + 'cebfb4e614a8878297306d943663e765a8f5e251',
   'v8/third_party/icu':