Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/b93b922..42a7475

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/71681bf..3481902

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

Change-Id: Ia00d2079baa6b379770e3e710a5614c28d2191de
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1852744Reviewed-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@{#64214}

DEPS

@@ -71,9 +71,9 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + 'b93b92298b9dc1e79c6f08e054fbc2c00d3418fa',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '42a74754e7a2842b70f209969e3374087091a594',
   'v8/third_party/depot_tools':
-    Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '71681bf1e84a4829521cb8a33b7c3331d46580b8',
+    Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '3481902904a9e103f8391bc5e17385f537cadbab',
   'v8/third_party/icu':
     Var('chromium_url') + '/chromium/deps/icu.git' + '@' + '93a34f0ec19e6eb8a4d13322a62a3f1cec499ec9',
   'v8/third_party/instrumented_libraries':