Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/4d9947d..341d5fc

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

Change-Id: I3accdb1d3610e042c47540881e46907f1803ae56
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1595775Reviewed-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@{#61225}

DEPS

@@ -57,7 +57,7 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + '4d9947daaf8819e89c8d99eb6cba0e176cb1453e',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '341d5fc6c85bce6f9292822b5ae49ca831189b7c',
   'v8/third_party/depot_tools':
     Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + 'ccd2b4da9a7e6ddf126c0b4437db75201836154c',
   'v8/third_party/icu':