Update V8 DEPS (trusted)

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/60deb86..f87b9ff

Rolling v8/buildtools: https://chromium.googlesource.com/chromium/src/buildtools/+log/b79692f..15fa3e7

Rolling v8/buildtools/third_party/libc++/trunk: https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxx/+log/a4dc7f1..4d2c483

R=v8-waterfall-sheriff@grotations.appspotmail.com,mtv-sf-v8-sheriff@grotations.appspotmail.com

Change-Id: I976f25d255f7f0f346a29de870b24f9b974a3d71
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3917710
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#83415}

DEPS

@@ -94,9 +94,9 @@ deps = {
   'base/trace_event/common':
     Var('chromium_url') + '/chromium/src/base/trace_event/common.git' + '@' + '521ac34ebd795939c7e16b37d9d3ddb40e8ed556',
   'build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + '60deb86bb1fa4e97704125cb7bdefcd157c37861',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + 'f87b9ff92eb2b16cd9b0e8998aebf8ec06433181',
   'buildtools':
-    Var('chromium_url') + '/chromium/src/buildtools.git' + '@' + 'b79692f320d80b158ce069f166f32861c36c6074',
+    Var('chromium_url') + '/chromium/src/buildtools.git' + '@' + '15fa3e772dfb58c8e912861b0af62977dd851072',
   'buildtools/clang_format/script':
     Var('chromium_url') + '/external/github.com/llvm/llvm-project/clang/tools/clang-format.git' + '@' + '8b525d2747f2584fc35d8c7e612e66f377858df7',
   'buildtools/linux64': {
@@ -120,7 +120,7 @@ deps = {
     'condition': 'host_os == "mac"',
   },
   'buildtools/third_party/libc++/trunk':
-    Var('chromium_url') + '/external/github.com/llvm/llvm-project/libcxx.git' + '@' + 'a4dc7f17ca393e764685d475bbf65ff8f71a0800',
+    Var('chromium_url') + '/external/github.com/llvm/llvm-project/libcxx.git' + '@' + '4d2c483d6df5b7d9ce4ac06d635be9412d79d22f',
   'buildtools/third_party/libc++abi/trunk':
     Var('chromium_url') + '/external/github.com/llvm/llvm-project/libcxxabi.git' + '@' + '5c3e02e92ae8bbc1bf1001bd9ef0d76e044ddb86',
   'buildtools/third_party/libunwind/trunk':