Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/75b91a2..7a7c931

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/556c0a2..8001297

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

Change-Id: Ia59597b2eb46666a63b632150da87c7d5f00be10
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1932606Reviewed-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@{#65132}

DEPS

@@ -79,9 +79,9 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + '75b91a2d2b31a353e7e914e9e8536106a7afb489',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '7a7c931175c7d156573798f5db0e90e5782a1839',
   'v8/third_party/depot_tools':
-    Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '556c0a2e0f48bf57fea351ef83685433600f8a16',
+    Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '800129711d28549962e99dfa08007d9d79e4f7a3',
   'v8/third_party/icu':
     Var('chromium_url') + '/chromium/deps/icu.git' + '@' + 'dbd3825b31041d782c5b504c59dcfb5ac7dda08c',
   'v8/third_party/instrumented_libraries':