Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/5ecd95d..c835251

Rolling v8/buildtools: https://chromium.googlesource.com/chromium/src/buildtools/+log/4401ea9..99a2527

TBR=v8-waterfall-sheriff@grotations.appspotmail.com

Change-Id: Ib82b5138717778827b86736ad8c3213cf94a2792
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2790503Reviewed-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@{#73698}

DEPS

@@ -88,7 +88,7 @@ vars = {
 
 deps = {
   'build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + '5ecd95d6f70f8b026a55a44a99c053a34b6918cd',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + 'c835251514d8f8e65e018462daad74814ed01f78',
   'third_party/depot_tools':
     Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + 'e0de6a88e5385ee9cd38d5e87f97456bbad8e7d2',
   'third_party/icu':
@@ -96,7 +96,7 @@ deps = {
   'third_party/instrumented_libraries':
     Var('chromium_url') + '/chromium/src/third_party/instrumented_libraries.git' + '@' + '6900bf4e274fdd94e3b074a65144554466cad5da',
   'buildtools':
-    Var('chromium_url') + '/chromium/src/buildtools.git' + '@' + '4401ea90ed6aefafb78fc3907df1794fc79f6664',
+    Var('chromium_url') + '/chromium/src/buildtools.git' + '@' + '99a2527e919b496f3d2849c77c5bbed4bdccd5a4',
   'buildtools/clang_format/script':
     Var('chromium_url') + '/external/github.com/llvm/llvm-project/clang/tools/clang-format.git' + '@' + '99803d74e35962f63a775f29477882afd4d57d94',
   'buildtools/linux64': {