Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/be684b6..7f6e669

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/764ec87..b1a3e41

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

Change-Id: Ibbd0ce6b24afb23aef2d487e252ac2c841d14c0a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1668445Reviewed-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@{#62299}

DEPS

@@ -57,9 +57,9 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + 'be684b6e1a946abe262b79b67e1f9e2041482231',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '7f6e66950aa3a218b50ac9f0f84d40504f1dc786',
   'v8/third_party/depot_tools':
-    Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '764ec87e51cd63d517f05a38a1cc87ff562680e0',
+    Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + 'b1a3e411d38e2a8da3ba7ec81a4b9b95cde0993e',
   'v8/third_party/icu':
     Var('chromium_url') + '/chromium/deps/icu.git' + '@' + '9f0f47b1e410b137762f2e3699359f0dbfcdbc05',
   'v8/third_party/instrumented_libraries':